All Jedi use the force. But if you use the force, you could also be a Sith. If All force-users on the dark-side are powerful. This statement doesn't preclude a powerful force-user who is on the light-side.
When you apply, schools usually email you for an Application Status Checker user ID and a password, which is usually in the receipt confirmation email. Have you received it? If not, you should probably call them.