You should have gotten an email with your username and password. If you haven't received it, check your spam folder. (Hotmail and AOL are especially bad about sending initial sign-up messages to spam/ junk.)
You can also use the password reset to get your username and password.
If you don't see the reset email in your inbox, check you spam folder.
If these self-help steps didn't solve your problem, please send an email to support@allceus.com
As Always, Thanks for using AllCEUs!