I've put a paper on the layout I'm making now, and found the picture I want to use. Now I want to put an element on my LO. When I drag the element over to the LO, I can put it on there, but I can't get to move it to where I want it. I get a warning that I can't move it because the layer is locked. How do I do this??

I use Photoshop 6.0, and I don't know how to unlock the layer.