advertising pictures

Hi

First of all, I don´t even know if I´m allowed to write these kind of questions here? if I´m not, sorry.

I´ve downloaded a template called gray_tutu. You can see my page here

In the top right corner, there is 4 pictures that says ads and the height and width of those. The name of those pics are !ads02.

Of course I want to use those spots, but I have looked everywhere without finding the right place to add my own pictures if you know what I mean.

I could overwrite the recent pic with a new one, but then those four pics will be the same..

I would like to have one big picture, how do I do that?