If after uploading XenForo, you do not see an ".htaccess" file in your XenForo root directory, rename htaccess.txt to .htaccess (be sure to include the "." prefix). You should now be able to enable friendly URLs. If, after enabling friendly URLs your XenForo installation does not function correctly, please contact your host to confirm that they have mod_rewrite installed and allow overrides via an .htaccess file.
I dont know the details in full. But godaddy is the host. Trust me when I smh.. I didnt make that decision. But im trying to set these up for a friend. Now when I go to log out of the forums, It gives me the 404. I have included to screen shots. One is the ftp. the other is the 404 error code when I attempt to logout