Use Contributors tab
A Contributors tab appears when you click a file that was added to the 
Sessions tab. This tab shows rows and columns you use to collect metadata regarding who contributed to that file and any subordinate files.
Do any of the following:
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Add or edit contributor metadata:
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In the Name column, type the name of a contributor.
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If the contributor is also currently in the People list, a drop-down list appears as you type. You can select the person in that list.
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In the Role column, select the contributor's role from the list.
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In the Date column, select the date of the contribution.
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In the Comments column, type additional information about the contributor or the contribution made.
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This is optional. The comments need to be brief. No scroll bars will appear, and the lines do not wrap. You can change column widths.
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Repeat this step for each person who contributed to the added file.
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Remove a contributor (remove a row):
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Click the row, and then click the
button that appears at the right end of that row.
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Examine the contributions made by a person in the Contributions tab (more).