1 yes and no - the moderators and you can see your past usernames general members cant
2 best bet is to upload it to somewhere like photobucket and then use that link for ryl (someone else more technically minded will help if you still arent sure)
3 yes - below the smileys v there is a bit where you can add things like polls one of the options is thread subscriptions and voila - if you want to subscribe to a thread that you havent started when replying click go advanced and then below the smileys v ........
4 as far as I know you can either pm a chat moderator (green names) or send it to the chat mods emails which is
chatmods@recoveryourlife.com