How can I add an image to a post and have it "float" so the text wraps around it?

This seems really basic but with how this theme works I cannot seem to figure out where to put the coding or how exactly to write it. In my current situation, I want to be able to add multiple pictures to a post. The first will be top left (3 lines down from top), the second, middle right and the third, bottom left. The text of my post will write around these pictures. The way I understand it, you have to set the pictures so that they "float" so that the text doesn't push them around but wraps around them.

Am I totally off here?

Anyone have a suggestion for me?

My site is http://www.InspirationalParenting.com