Anyone has any problem in using Template Modification System - vBulletin.org Forum on 3.7.0 b4? I am having hard time trying to find out how to use it.

Right now, I am using 3.7.0 b4 and seem like nothing works for me. I selected the "Add Modification Template" on the dropdown menu from the Master style and nothing happened...

If anyone has been using this hack, please share me the purpose and how to use this hack?