From the login screen select Forgot username / password?

Then select whether you want to retrieve your username or your password.

If you chose to retrieve your password, you will see the following screen. You will be asked to enter your username and email address used when registering for MyLymeData, and a temporary password will be emailed to you.

If you chose to retrieve your username, you will see the following screen. You will be asked to enter your email address used when registering for MyLymeData, and your username will be emailed to you.