Prior to your arrival, you will receive an email directing you to login to DORMS to complete registration. If you have received this email, but do not see the DORMS registration button on the DORMS home screen, this means that you did not fully complete program acceptance.
Visit the DORMS Guide for more information about using DORMS and troubleshooting technical issues like this one.
If you still need assistance, submit a request to the Disney Programs team here.