I installed phpNuke,got it working perfectly. Yesterday I uploaded a new theme for the website,then i went to the Administration panel on the phpNuke,and changed the theme to the new one,and now when i try to get on my site,it doesnt show nothing,only a blank page,with nothing,absolutly nothing on it.i tried many things but nothing worked, Before adding the theme i created a backup of the database, but it doesnt work either. So i would like to know if there is a way to change the theme without accessing the Administration panel on the website, only using the Zymic control panel and FTP.

Any kind of help would be welcome