All you need to do is :
1.) Edit the .htaccess file in the public_html folder.

2.) Add the following line into the .htaccess file:

3)Save the .htaccess file.

The use of register_globals has been discouraged for years now because it's very easy to introduce security holes into your applications. It's being removed completely with the release of PHP 6.

The only time you should do this is if you have an old or poorly-written script you can't do without or can't update.