If you set up a dropbox folder when you created the group and have that dropbox item tied into a gradebook item, the grade that you give will be automatically applied to each member in the gradebook.
If you need to adjust an individual member's grade, you can do so in the gradebook. Just click on [Grade Item] for the grade item that you wish to change and then adjust the grade (pictured below) as if you were changing or adding any other grade manually.
D2L 9.4.1 – January 2012
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