Before editing or replacing files, strongly recommended to create backup of your files!
You can download attached files. Just replace original files with this one:
1) file page.php (it lays in directory \wp-content\themes\getphoto\includes\acf\page-templates\);
2) file helpers.php (it lays in directory \wp-content\themes\getphoto\includes\);
3) file main.js (it lays in directory \wp-content\themes\getphoto\js\).
Now you can add own custom link to page you want.