How to pin a topic?

Sorry if this is a dumb question, but I can’t seem to find the answer anywhere. I see how to bookmark a post, and how to set a topic’s notification level (Watching, etc.) but how do I pin a topic to the top of the topic list?

You cannot pin a topic. Pinned topics are pinned for all users. If a TP staff member, or a moderator, has pinned a topic you might need to re-set it after you have read it (there should be a drop-down menu for that at the bottom?) but you can only bookmark a topic.

When you bookmark you can sort and search your bookmarks.