I was just wondering how to blend in my render into my sig, I heard some people erase it, but how do I erase or "soften" the edges, because when ever I use an eraser it has to be like a solid color or something? I know its a noob question.
-Thanks

Right click and drag the hardness down.

Lol I just selcted all, how do I unselect? And do I just click on the render and right click?

And another question, I accidentally had it hide layers in the right hand side of photoshop it used to show layer 1/2/3/4 all in the right hand bottom corner and I would be able to select whichever one I want, how do I get it back. Man i have alot more questions too.

it looks always good when you put something in front of the render

Just lower the opacity or hardness of your brush.