Make sure you have the Navigation block installed on your course.
To install new blocks, turn editing on for your course and select “Navigation” from the list of items. Move this block up at the top, for easy viewing for students.
Cannot locate Navigation block, but have it installed?
Tip: You may have your block undocked, which will appear as a tab on the left of your site. Remember, with Moodle 2.0, you can undock any of the blocks.
Either select “Participants” from your People block OR
OR Enrolled users
OR “Enrolled users” from the Course Administration block
Access individual profiles
Click the link to navigate to the user’s profile
Expand “Forum posts” in the Navigation block under the user’s name
Posts or Discussions
Select “Posts” or “Discussions” to view individual user’s contributions
You will then be able to view all posts or discussions posted by that user.
Note you can also view posts in context , too.