How do I return an assignment to students for revision?

Community Novice

I assigned my class a reading log for the month of September, using Google Drive external tool. 2 of my student pressed submit before finishing the work. Now they cannot modify (keep logging their reading), and I cannot figure out how to push back the worksheets to those two students.

When I use Speedgrader I can check the work, but I can't see how to have them try again.

Thanks for the help!!!