In short
See the main forgot login / email help article.
This topic is covered in the main recovery article.
→ Forgot my login name / my email!
Short version: go to /Forgot and use the email address on the account.
Forgot my login name!
More Membership Help
How to prevent email going to the spam / bulk folder
How do I change my login name?
Forgot my login name, password and changed my email!
Forgot my login name / my email!
I didn't get my re-activation / password change email!
How do I change my email?
How do I change my password?
Where did my Private Messages go?