How do I move the Author Box or Avatar Box on my post page?

I'm new to these themes and this is a lot different than what I'm used to working in so I need a little help.

All I'm trying to do right now is move the "Author Box" or "Avatar Box" from it's current position so it doesn't stick out to the side and waste space all the way down the page.

Here is the link:
http://itcibitci.com/2010/08/06/rbf-groups-living-food-juicing-for-beginners-tip1/

As you can see the green box with the pink avatar is sticking out to the side of the header text... I don't want it out there I want to move it in with the header text so the post is flush to the left edge.

I have no freegin clue where to find this code so I can make changes.

Any help would be greatly appreciated!

Thank you!

-Echo