move the sidebar

Hey guys I really love this theme!

I’m bussy editing the whole a bit to my needs but I have some problems to put the navigation on the left.

I searched the css but if i set it to float left nothing happens.
Same if i edit the page.php so that I get:

<?php get_header(); ?>
<?php get_sidebar(); ?>

and then the rest of the page.

Can someone help me with this issue?

tnx a million!