To reinstate a student who has previously been dropped or denied access, or to manually approve students requesting to be in your course (we discourage UT professors from doing this as rosters sync automatically with the registrar lists), please navigate to your course
Click 'Approve Enrollments' on the left side bar
Find the student, (in the dropped section if previously dropped, awaiting approval if requesting enrollment) and click 'Approve'
This will put this student on your roster, and the student will be able to see all published assignments after a short generation wait.