you have to register with the ADA on their website, they will email you an eligibility # after you fill out the info under "pre dent" section. Or just search "DAT" on ADA's website. good luck!
I believe the eligibility ID is the same as the application ID. I tried it when I first got that email but it did not work either. Called them and they said to wait a few hours and try again, after that it did work.