That blank screen means you have a PHP error, but your site isn’t set up to show you the contents of the error, so you get a blank page.
If you create a new file with the name .htaccess in the root of your site and put the following into it (or, if you already have a .htaccess, add this line to it):
php_flag display_errors on
and then revisit the page, you should see the error output. It’ll probably be something simple, but if you don’t understand, paste the error and the lines it complains about here and someone will help I’m sure ??
