You can enter all the ITF World Tennis Tour Juniors events on the ITF IPIN.
The online service has a full calendar of events and details on how you can enter.
Find out more about the ITF IPIN membership and sign up:
The name on your ITF IPIN must be the same one that you registered with the LTA. Memberships are only valid for 12 months so make sure yours is fully up-to-date before entering a tournament.
For a guide on how to use the ITF IPIN, visit here.