membership script

First you must load the folder membership (rename) to your server. Then must install:

www.yourdomain.end/membership/install.php.
You also need a MySQL database!

Then read the readme.txt.
This is very, very difficult to integrate this in x5. You need a lot of experience.
One cannot this explain simply so.
Almost every side must be integrated into X5 and then is adapted in the code.