I'm not sure what you're asking, but if you have a whole big image for your layout and then you have a little box for where the blog entries go, it would be this code:
CODE
<!-- begin code provided by createblog.com -->
<DIV style="margin-top: 150px; margin-left:
243px; width: 412px;OVERFLOW: auto;
height:359px; BACKGROUND-COLOR: transparent">
<!-- end code provided by createblog.com -->
The "margin-top" and "margin-left" is where you need to change the pixels to get it exactly where you want it.
Hope that helps.