open both images. With the move tool, drag the one you want in the foreground onto the other one. For your first try, use the migic wand or lasso to roughly remove the background. Then grab the eraser and go in a little finer. This will give you a feel for it.
You will discover though that most people use quickmask or layer masks for jobs like this.
quickmask is one of those buttons under the colour picker. When it is used, you'll notice that when you paint it leaves red studd everywhere. When you switch back to normal selsct mode, this red ares will be selected. This is handy because it eliminates fumbling with shift and control to add/subtract from selections, and it adds more precision.
Layer masks are added to a layer with a button at the bottom of the later pallette. an icon of the mask appears beside the icon of the layers contents. Anything you paint black in the mask will not be visible. shades of grey give parial opacities. This technique is handy because it allows you to mask off the later without actually losing the layer's pixels. You can adjust what you want masked continuosly. whereas with the eraser, once you erase it it's gone.
I hope I've explained reasonably. I'm not very good at explanations. Really though, countless noobs before you have asked the same question, and searching for the replies they recieved may be easier. Google would help too.
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