Sometimes a script requires that at the server the global_register function is enabled.

Many hosting providers turn this function off for security reasons but there is a short workaround to

enable this function ocally only for the script which requires this function.

Just open a text editor like notepad and add the following line
register_globals=1

Then save this file and give it the name php.ini

Now upload the file to the installation folder of the script which requires this function.

I.e. you installed the script xyz to the following path
http://www.domain.com/xyz/

Then the path where the php.ini file should be located after uploading it is
http://www.domain.com/xyz/php.ini