You can pay your dues using this link which is also on the home page.
If this is your first time signing in to the "MEMBERS" section, you will be prompted to activate your new ASBDA (Gmail) account. Don't forget to set up your recovery email and/or two-step identification.
Make sure you are using your ASBDA credentials to sign in. If you receive a 404 message, you are currently signed in under another Google Account. Go to google.com and sign in to your ASBDA account.
This is a google issue, unfortunately.
Everything has been set up for you. If you are still having trouble, please email Chris Word.