Forums predominantly function as a means of communication between instructors and students, but they are also gradable activities. If you set an aggregate type and a point scale for ratings when you created the forum, you will be able to give point ratings to individual posts.
From your course page, click Forum to go to the forum listing.
Click a topic’s name in the Discussion column to see the posts in that thread.
Under each student’s post, you will see a Rate drop-down. Click this drop down and select the number of points to give to this post. Depending on how your ratings are being aggregated, these ratings will be averaged, summed, or otherwise evaluated to provide a grade for the forum activity.