When I try to make a publisher account, it says that user already exists, even though all I have is a normal account. Do I have to MAKE a new e-mail account to become a publisher? Is there a way to delete my account so I can re-register as a publisher?
You need to have a Unity asset store account. If you have that, at the publisher login page, just enter your asset store account email and password and your publisher account will be made.