How to add an image under the "Information Box"

I am using the classic template and want to add an image under the information box on the left side column, how do I do this? Is this something with just css or is there some major coding involved?

You would have to code the HTML into the the file that holds the information box infor:
I think that is here:
catalog/includes/modules/sideboxes/information.php

Look for a post on changing links in the size box I beleive all your need to do is add the IMG tags to where you want your Picture to go. I would not make the picture very big either. like 40x20 or 30x20 something small.

You can try this for the information sidebox - search for this tag and if it does not exist add it with these statements

#informationContent {
background-image: url(../images/your_image.jpg);
background-repeat: no-repeat;
background-position: bottom center;
}

Then pad to allow space