Okay. I'm a terrible explainer, but I'll try anyway!
There's Box A, which goes on the left, and Box B, which goes on the right. You have to use the "div style," NOT the "p style."
For BOTH boxes, you have to set the height/width limit so that they're equal (if you want them to be the same size).
For Box A, you have to include "float: left" in the source code for it. For Box B, you have to include "float: right" instead.
When you set the widths, you have to make sure they're not too wide. Otherwise, they won't be able to fit side by side.
OTL. Did that make sense? Idk. I tried. If you don't get it, I could do an example for you, and give you the code. xD