That should be a pretty quick fix, actually.
If you are confident that modifying the main-footer-footer.php file caused the issue, you might try just uploading a fresh copy of that file using your ftp client.
If that fails, you can use your ftp client to rename or remove the customizr theme folder and then log back into your site (try tedxoaklanduniversity.com/wp/wp-login.php) and the default WordPress theme should take over.