To turn register globals off, you will need to create a php.ini file in the folder where the error occurs, and insert this line.
register_globals = Off
Same steps apply to all other php settings. (e.g. magic_quotes, auto_append, allow_url_fopen)
We can upload a pre-made php.ini file for you, and you may change it as you need. Simply contact Mexxus support.
NOTE Mexxus cannot know why you want nor need to change this setting. You are changing this at the advice of your webdesigner or the developer of your script. Mexxus can only show you where to make the change.
