Hi, welcome to the forums. You get credits by posting. In some subforums you do not get credits, but in most you do. With credits you can buy or sell anything you made and is art-related. You can also sell other things, but you must read the rules for that. Good luck. Btw, a topic like this should go in de feedback subforum: http://www.gamerenders.com/forum/index.php?showforum=7
