You can get a one-time login link mailed to you by clicking on request new password on the left side of the site. Here you can enter either your username or your email address. It will send you an email with a link that you can click on to log in - and then change your password.

This link may land in your spam folder, so look there. And please add wsl@warmshowers.org to your "Approved senders" list or your address book to prevent that from happening.