How do I change the depth angle of a picture in Photoshop?

I have a picture with a wall in it. The wall is moving away from the camera at an angle. I want to photoshop a picture onto it. Obviously if I put the picture on "as is," it will not look like the picture is on the wall. How do I angle that picture so it will be at the same angle as the wall so I can... show more I have a picture with a wall in it. The wall is moving away from the camera at an angle. I want to photoshop a picture onto it. Obviously if I put the picture on "as is," it will not look like the picture is on the wall. How do I angle that picture so it will be at the same angle as the wall so I can paste it on to look like the picture was already there?
Update: I mean as in how to make it look like one end of the photograph is closer to the camera than the other end.
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