How would i add an image as a background onto photoshop?

basiclly I have an image a .PNG File and I have a layer of a t-shirt open on photoshop...how would I put the image as a background on the t-shirt?








Help pleaseHow would i add an image as a background onto photoshop?
Go to Layers -%26gt; Flatten Image.





If you're curious about the other options there, merge layers and merge visible, it's simple. Flatten image basically combines all of the layers to make them into one. Merge down combines the layer that you choose with the layer you see below it. Merge visible is basically like 'flatten image' but it only combines the layers visible on screen. Those that are not are left alone.





Oh, and any of those three options work in your situation.