How you rate discussion posts depends on which rating scheme is enabled. You can rate posts using stars or by up voting and down voting.
Note Instructors can set rating schemes on a per-topic basis.
Rate posts using the Five-Star rating scheme
Rate the post by clicking on the number of stars you think the post deserves in the Ratings area of a user's post. You can give a maximum of five stars.
Rate posts using the Up Vote/Down Vote rating scheme
Click the Up icon to increase a post's rating. Click the Down icon to decrease a post's rating.
Rate posts using the Up Vote Only rating scheme
Click the Up icon to increase a post's rating.