Marking a discussion board reply as helpful
Sometimes it can be beneficial to mark the most highlight certain posts in a discussion, as it can help readers home in on the most useful information. For discussions that are not designated as questions, you can mark posts as "Helpful", which highlights the post in the thread. Any user can mark a post as helpful, but only the original post's author or an admin can remove the designation from a reply.
Any reply -- not the original post -- can be marked as helpful by clicking on the Helpful link in the bottom right corner of the post. Once a reply has been marked as helpful, it will be highlighted in the thread.