Membership probleme subscription

Hello to all

I have a problem with membership:

Two levels, free and paid, when a level paying member wants to register it arrives after its inclusion on the page requesting payment for the subscription, if it goes further and do not take the subscription, it is still registered but no longer have access to any page on the site and therefore can not do anything or re-register with the same email address …

Is it possible to block its registration or other solution?

Thank you for your reply

(In fact thank you to Tyler’s links were perfect …:wink: