Blank page after locating Mage.php

Hi,
I had to move my wordpress site so it could be in the same server with magento, and now it is locating Mage.php, but as soon as I save the changes, it goes into a blank page and I cannot tell what I am doing wrong. I replaced the functions.php …but I am unsure about the Package Name and Theme Name (the third one is optional in this phase of configuration right?). How can I find the exact Package Name and Theme Name, I went in the backend of Magento and it said the Package Name was Default, and the Theme Name was blank, so I tried Base … then Default, but still the blank page.
Can you help?
Thank you in advance!

https://wordpress.org/plugins/magento-wordpress-integration/