How do you add an image on an image on adobe photoshop?
You probably mean how to combine images. There are several ways
to do that in Photoshop: open 2 images in Photoshop, convert
background layer to normal for image nmb. 2 then drag it into
window with image 1. Another way is to use File > Place command
to import image from hard drive into document with already open
image in Photoshop.