Did you buy this template? Generally those have instructions and/or precomps where you place the replacement images.
Without seeing or having access to the project it's pretty difficult to know exactly how it's set up and be able to give you much more than general help.
Johnny Cuevas, Editor
"I have not failed 700 times. I have succeeded in proving that those 700 ways will not work. When I have eliminated the ways that will not work, I will find the way that will work."
---THOMAS EDISON on inventing the light bulb.