Hi Philip,
Go to your joomla admin>Extensions>Template Manager>Your Template>Layouts tab. Say you are using the ‘default’ layout, then click on the Edit link in front of the layout and find <blocks name=”middle”… Below this you can see the blocks with names ‘col-mass1’, ‘left’, ‘right’, ‘col-mass2’ etc. You can make changes here to have 1 column / 2 column, on left / right of the main content area. For further details on this you can refer to http://wiki.joomlart.com/wiki/JA_T3_Framework_2/Guides#Layouts
If you need more help with this, please send a screenshot of the final layout you want to have.