You have to edit your index.php file, which isn't something you can do via the admincp.
Just go through index.php, search for the code that jugo posted, and in every instance that you don't want it centered, remove the align="center". I think it appears about 3 or 4 times in the code, and each time, there's a comment above it to tell you what part of the forum it's referring to.
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