The buttons on the toolbar at the top of the µTorrent interface allows you perform some basic functions, most of which apply to the currently selected torrent(s). The order of the list here reflects the order of the buttons in the toolbar. If you are unsure, you can place your mouse cursor over a button, and a tooltip should pop up providing the description of the button. The toolbar's visibility can be toggled by selecting "Options" then "Show Toolbar" in the main menus, or by pressing F4 on the keyboard.
Add Torrent prompts you for the location of the .torrent file that you are trying to open on disk. If you set a default download location, the torrent job will automatically be added to the torrent jobs list and started (if you did not set µTorrent to start torrent jobs in stopped mode).
If you did not set a default download location, you will be prompted
where you would like to save the torrent contents, with the Add New Torrent dialog being shown by default.
Add Torrent from URL
allows you to open a .torrent file directly from URL without having
saved the it to your hard disk. Depending on the method used by the
website for authenticating users (if any), the URL may have to be
entered in a specific format. Magnet URIs may be used here, and µTorrent will attempt to download the info dictionary from the corresponding .torrent file from any other client that also supports the URI scheme.
Add RSS Feed opens up the Add RSS Feed
dialog, where you can add RSS feeds for µTorrent to monitor. This is
hidden by default in the torrent view, but is shown while viewing
Feeds. To show the icon, disable Narrow Toolbar in the main menu.
Create New Torrent lets you create .torrent files that you can use to share your data with other people.
Remove will remove the selected torrent job(s) using the default action when left-clicked. This default action can be set by right-clicking the button, holding Shift on the keyboard, and left-clicking one of the four possible options. The default remove action can also be performed by pressing Delete on the keyboard. By holding Shift while pressing Delete, µTorrent will also remove the torrent contents in addition to performing the default remove action.
- Remove removes the selected torrent job(s) from the list, but all related files are left intact on the disk.
- Remove and delete .torrent removes the selected torrent job(s) from the list and the corresponding .torrent file(s) from the .torrent file storage location.
- Remove and delete .torrent + Data removes the selected torrent job(s) from the list, the corresponding .torrent file(s) from the .torrent file storage location, and all content downloaded from the torrent job(s).
- Remove and delete Data removes the selected torrent job(s) from the list and all content downloaded from the torrent job(s).
- Move to trash if possible tells µTorrent to attempt to move any deleted file to the Recycle Bin first rather than deleting it immediately off the disk. This works only if the Recycle Bin has enough space allocated.
Start
will start the selected torrent job(s), or add it onto the queue if the
number of active torrent jobs has reached the maximum set in the
Preferences.
Pause
will pause the selected torrent job(s), but won't actually stop it.
This tells µTorrent to attempt to retain connections to peers without
having to re-establish them like starting stopped torrent jobs would
require. It is useful for when you need quick access to bandwidth.
Realize that while µTorrent won't drop the connections on its own
accord, the connection can still get dropped by the client on the other
end of the connection.
Stop will stop the selected torrent job(s). All connections with peers are dropped.
Move Up Queue
will decrease the selected torrent's queue number, thus bringing it
closer to the top of the queue (meaning it will become active sooner
than those with higher queue numbers). Holding Shift
while pressing this button will move the selected torrent job to the
top of the queue. Note that this button will not visually move the
torrent job up the list unless you sort the list by the "#" column.
Pressing Ctrl+Alt+Up on the keyboard is equivalent to pressing this button when a torrent job is selected in the torrent jobs list.
Move Down Queue
will increase the selected torrent's queue number, thus bringing it
further from the top of the queue (meaning it will become active later
than those with lower queue numbers). Holding Shift
while pressing this button will move the selected torrent job to the
bottom of the queue. Note that this button will not visually move the
torrent job down the list unless you sort the list by the "#" column.
Pressing Ctrl+Alt+Down on the keyboard is equivalent to pressing this button when a torrent job is selected in the torrent jobs list.- The
Search
field allows you to enter a query to be searched on the selected search
engine. To perform the search, press the button next to the input
field, or press Enter on the keyboard. This
will open the search results in your default web browser. To change
search engines, click on the dropdown arrow next to the search button.
If you are using an operating system older than Windows XP, you will
need to right-click the button to see the search engine selection menu. Note that the search button and search field will be hidden if the search engines list is empty. - The
Torrent Filter
field allows you to search through your list of torrents by specific text. You can access the torrent filter by clicking the small arrow to the right of the search icon and selecting "Filter My Torrents," or by pressing Control + F. If you are using an operating system older than Windows XP, you will
need to right-click the button to see the search engine/torrent filter selection menu. As you enter text your list of torrents will be filtered automatically, and only torrents that match your search text will be displayed in the main list of torrents. To remove the filter and view all torrents, simply remove any text from the filter box. 
Toggle Torrent View will change the main-view look between the more clasic list-view and a more graphics-oriented - look & feel.
µTorrent Remote opens up the Remote dialog, where you can configure most of µTorrent's options.
Preferences opens up the Preferences dialog, where you can configure most of µTorrent's options.