How to create sidebar / column on responsive homepage?

I’m using a responsive wordpress theme to build my new website (http://kwma.fredserva.fr/?themedemo=kwma).
I would like to create a widget area on the right hand side of the homepage (http://www.waziproject.com/wazimagazine) in order to have a sidebar on the right hand side in which to showcase banners.
I’ve tried using code from http://www.responsivegridsystem.com/, but I’m simply not managing.
I guess in the end I just need to create a column within the container before the loop starts, right?
Any help would be tremendously appreciated!