The Grade Center feature allows you to enter grades for an individual student or several students at once.
To enter grades for an individual student:
Step 1: Login to your course, click on the Control Panel link, and select Grade Center.Step 2: Click on the column cell belonging to the student whom you would like to assign a grade.

Step 3: The cell will now contain a cursor and text box in which you can enter a grade manually.

Step 4: Once you have entered the grade, hit the Enter key to save.
Step 5: The updated grade will now be displayed. The orange marker in the top-left corner signifies a manually updated grade.