If you have forgot your username, enter your E-mail address, then click on the Send Username button and your Username will be sent to your email address.
If you have forgot both username and password, first retrieve the username, and then the password. To recover the username, enter the E-mail address leaving the username field empty, then click the Send Username button, this will be sent to your address. From there you can use this same form to recover your password.
If you have forgot your passwordbut remember your username, enter the latter and your E-mail address, click the Send Password button, you will shortly receive a new one to use to access the site.