I'm using 6.0.0005 here and there is no drag on or drag off facility in the Join form builder, I can either make the fields visible or invisible. Once invisible they generate error messages on the "email sent" page after a member joins which shouldnt happen as the fields were made invisible. bug?
I must be going mad because I cant find where to edit "edit profile" in the Builders section, or anywhere else for that matter.

Is this happening in 6.1?