Register for a site-wide account.
Enter E-mail to get a username reminder:
Reset password by entering your username and its registered E-mail address. A temporary password which can be used to log in and reset your account will be sent to the registered address if it is associated with a valid username.
If all else fails, please E-mail the site administrator - they should be able to reset your account.
If you are registered for different databases with separate accounts, these can be merged so that you only need to log in with this one site account. Please first register for a site-wide account (see link above) and then E-mail the site administrator with a list of databases you are registered for and your respective usernames.