You can be a kidstaff by going to the "Tutorial suggestions" forums. The first forum at the top says about being a kidstaff so click there. Post a reply and send in your best tutorials, they have to have decent views, and at least 5 star ratings, being a good artist isn't another way to be a kidstaff either. You have to have a nice attitude with members too.
Or if you want to do it in generel just post a comment on Gilstaff's page showing links to your best tutorials on drawingnow. Although I guess Gilstaff doesn't go online much but I heard he checks the tutorials and accepts them...I HEARD. Anyways I really hope this information helps you !