Hello!
I have Adobe CS4 and I cant seem to take one picture that I have opened and put it on another picture I have opened.. does that make sense?

basically, more detailed, I have an image of an alley with a brick wall.. I'm creating a flier for a show and want to put an image of a band on the brick wall but cant seem to just.. 'copy and paste'..

also.. the wall is slighty tilted.. how do I tilt an image?
Thanks!