How do I Change The Title of My Forum Topic

I don't know if this is possible, but if it is how do I do it? If this isn't possible could someone let me know if they think the best move would be to continue using my current topic, or to start a new updated topic. I'm leaning towards just keeping the current one.

Edit Post, the pencil on the top right of the very first post.

Thank you, I don't know how I didn't see that