The IP can be shared, especially among virtual domains that are done using names, and not IP addresses.
There's a few other things you need to look into. First of all, i was able to create an account, but there's an issue with your index.php page.
PHP is working since the script ran, but the index.php isn't forwarding me. I get the standard default install page for apache. Where is enla.net going on your server? do you know???
What version of Linux are you running??? If your not sure, that's cool. We'll just figure it out from there. Typical apache installs put the default web folder as /var/www/html/ <~~ Location for the index.php script from the zip file. Everything else should go under that. What i think is happening, is people click on the link on your site, and are taken to the signup for the redirection, but aren't reaching that point when then run it.
It's kind of confusing, and if you don't understand, let me know... I'll email you some instructions for fixing this. Very common mistake.
-Biz
Bizzar@comcast.net