To register your child, create an account on the top right of the screen and add your children as participants.  Once done the listing of divisions they can join will be listed on the order page.  You will also be able to sign up as a volunteer during the same process.  Detailed instructions can be downloaded from here: new_user_profile.pdf 
If you'd like your child to play up into the next division, after you complete your order send a note to [email protected] with the request.  If there is room in the division we will transfer the player.