Question about setting up a free premium account - issue with free gateway and no sign up info

I am testing the plug in. Have to set up a free membership website (as of now). I have enabled the free gateway and created a Premium acct as opposed to what visitors see - but have found when I test the sign up button, it doesn't go anywhere. When I right click and open in a new window, I get what looks like a paypal button but there is no place for the user to enter a name and email account to register for the account - it just defaults to the welcome page when you click the button. Ideally, I would like the user to be prompted to sign up to create a free account. Where do I set that up?