I'm having a bit of trouble with a registration page. I'd like for people to sign up and login with just an email address and password - no usernames (and some custom attributes that I have no problems with). I can configure the login to ask for email and password in the dashboard and this works fine. But when I remove the form code on my register.php in single_pages for the username field, the form breaks.

Is there a way to remove the username field from the register single page?