Just comment something like 'Ping me!' here, so that I can ping you when the roleplay opens. I would ask that you refrain from commenting if you are not interested in joining the rp, as it will make it harder for me if I have to sort through unrelated comments.
Support is appreciated! I won't ever say anything against you giving an idea or kind comment! Just make sure that you put the 'ping me!" in the beginning so I won't have to search for it. :)