Swamp probably covered it, but here is the info you need.
You need module change and draw stop setting. If your bow came set up with 25" and your friend just moved the draw stop without changing the module, then all you need to do is change the draw stop back to where it suppose to. Otherwise, you'll need to change the module. Check the module # against this chart and see if you have the correct module. Then set the draw stop.
http://www.diamondarchery.com/downloads/DMD08_ModPost.pdf