How do you edit your posts?

I feel a little dumb asking this as the answer is probably obvious but I can't see an edit post button anywhere.

I see this
You may post new threads
You may post replies
You may post attachments
You may edit your posts

I see quote, multi and quick I have looked at all the mini menus but I can't see how to edit.

Apologies in advance for being dumb

After you first post something I think you have about 5 minutes if you need to correct anything, after that the edit button leaves that post and you can no longer edit them.

Excellent thanks