2 Templates in one forum

why my main page and forums show different style template where as i choose only one from my admincp

http://www.mknexusonline.com/ this one show another template

http://www.mknexusonline.com/forums/index.php and this another template

where as i want to use forums template in my whole site.

 

You have the vbadvanced portal default skin different than your default forum skin..

 

yes exactly how do i fixed this?