Upgrade from non-paid to Paid in Directory Plugin

I have my Directory plugin set up so that users need to pay to be able to create a listing.

When a new user signs up, he can go through the process - get to Paypal, and then cancel, taking him back to my website. At this point, he now has a login for this website, even though he didn't pay for it. He is a 'non-paying Directory Member'.

This is fine... but how does this person go from being a non-paying member to a paid one? If they try to keep their same login credentials, the system recognizes them and won't let them 'sign up' again. If they are logged in, there is nowhere for them to go to set up the recurring payments and become a Paid Directory Member.

Please advise.