Hey, welcome :) You're in the right section to find rps :D Ussually what happens is someone starting an rp will post in here with a brief rundown of what their rp's about. If you want to join, comment something along the lines of 'interested!'to let them know. They'll then make a the actual rp thread, where you submit a character you want to play as/any instructions they provide. Hope this helps a little!