There's a little button on the toolbar that says FAQ, that means frequently asked questions. Which is this link https://www.superhonda.com/forum/faq.php
when you to that page you can either search or there's 3 main links below that. There's one that says reading and posting messages, there's also one that says User Maintenance.
You'd add a picture to your signature the same way you add a picture to a post. All post rules apply to signature.
jason94accord, imagestation sucks. Only you will be able to see pictures from there because they are in your local cache. Imagestation does not allow outside use of photos hosted on their site, in other words all I see for your pictures are red Xs.
Also I missed why any of this is in the accord forum.