Membership Plugin Authorize.net payment gateway not working

I got all setup with SSL, auth.net got my api-key, id etc. and entered where appropriate into the plugin settings.

I get a form with no submit buttons, only a credit card icon that when I click I get a javascript error in the console for it trying to POST to https://www.mydomain.com/mywpdirectory/paymentreturn/authorizenetaim which doesn't exist, do I need to put something in this location? Please help.