You may sort posts using the "Sort By" menu. The display of posts will be ordered based on your selection.

My Posts & Comments: the logged in user will see their posts and comments at the top.
Oldest: Shows all posts in chronological order - oldest first. (default view)
Most Recent: Shows all posts in chronological order - newest first.
New / Unread: New and unread posts display first.
Flagged: Displays flagged topics first.
Instructor: Displays the instructor's posts at the top.
Name: Sorts alphabetically by last name.