Using imported pics

Ok, I am REALLY new to this, and was working on my first flash animation, and I wanted to use a pic that I found online, thing is, I only wanna use the head. Photoshop only seems to want to let me save it as a 4 sided image ( cant cut off all the edges around the head ). When I import it into flash, I cant erase the edges, and I cant even draw over the head itself ! Its like some omnipotent god image that I cant mess with, I can only drag it around on the screen… There must be a way to cut off those edges and make it so that I can draw over the image, can anyone fill me in?