there is a post by gilstaff that explains it all....but anyways you have to submit three tutorials to gilstaff. If they have high ratings and are really good you should be picked for kidstaff...... i've sent mine and i never got a reply...i don't tknow if mine weren't good enough or if they just never looked at them...but anyways good luck with yours! :)
heres the link to the post by gilstaff if you want it