I just bought my first Photoshop product, Photoshop Elements 12. When I try to layer an image, I try to click on the Layers Tab at the top of my screen, but I can't access any of the features. I've looked at many online tutorials, but they only describe how to work with layers. Help!
Most probably because you are eiting 16-bits files, especially raw files converted in the ACR module.
Elements does not support layers in 16-bits mode; if that is your case, use the menu 'image/mode' and convert to 8 bits. Or in ACR, set the option to 8 bits in the menu of the bottom bar.