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Hi
Let's see if we can clarify the question here:
Can you give the link to your site so we can see what it is that bothers you? What theme have you chosen to use? Can you contact the person who made it? or did you do it yourself?
You can change the way your pages look through the block settings. I have noticed however that some themes are using two columns not three -I am only familiar with themes with three columns so can you check and see if you have left center and right options in your block settings in admin? It is quite possible that the parts of your site you want on the left can be moved through the block system by putting them on the left.
In the help docs link below there is a doc called 'anatomy of a theme'. It might help also with your question.
HTH a little!