Making a Categorey page full width with 3 colums (WordPress)

Making a Category page full width with 3 columns (WordPress).

Hey guys,
The only way I can make my menus go to the correct set of category that I want is to set the menu to a link for a video category. They problem is that its pre set to 3 columns for the videos but in a 4 columns setting. So example it looks like there should be a 4th column but it stops at 3 and starts a new line. I have no clue what file to edit to fix this. Any help is much appriciated.

Template: http://videotube.marstheme.com/

It also took me a very long time for some reason to get a 3 column full width homepage but I figured out that setting.

Thanks!

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