Basic Adobe Photo Shop question

I've had adobe photo shop elements 6 for a few years now. Rarely use it. Not even sure why i bought it to be honest. But now i'm trying to do what i think is the simplest thing ever - take an image i've saved and add it on top of another image i've saved. For example - taking an image of a whiskey glass and putting into the hand of an image of bobby cox. For the life of me I can not figure out how to do it. Do i go to full edit with the existing image and bring in the other one? I'm lost to all hell and back. Any help more than appreciated.