*If you have set up your forum as a Graded Forum 
To grade a forum:

  1. Click on Discussions in your Course Content Menu or go to the Control Panel > Course Tools > Discussion Board
  2. Click on the Forum you want to grade
  3. Click on the “Grade Forum” button 
  4. Click on the chevron next to the Username of the student
  5. Click on Grade
  6. Enter Grade at the top of the page
  7. Scroll down to the bottom of the page, click OK
Supplemental Video: