After grading an assignment, students will not be able to view theor grade or feedback in the assignment area until their grades are released.
Select Assignments.

Select Assignments from the site's Tool Menu.
Select Grade.

Select the "Grade" link for the assignment with grades to be released.
Select Release Grades.

Select the "Release Grades" link. This will release grades for this assignment to all students in the course.
View released grades.

Once grades have been released to students, a checkmark in the "Released" column will appear and the assignment's status will change to "Returned."