Size of Home Page and Columns

Hi, my question are, I´ve the free version. Is possible to change de size of the Home Page? example... All pages (as me) with Chatch Everest leave, in both side, blank (is a section without use). This page (catchthemes.com) use all page´size. I understand? I want to use all page size, without blank sections. And the second question: I want to use 4th column and not 3 in the homepage. Is possible? Thanks,