ok i use paint and copy and paste to make the render show up on my sig.
well thats getting to be a pain in the ;D.
so i know this sound's n00bish but i don't care, how do you copy and paste using only photoshop?
You open your image in Photoshop, then you select it and go: Edit -> Copy. Then go to your other image where you want to paste it and go: Edit -> Paste.
Open your image, then do a Ctrl+click on the layer the image is on (in the layers window at the left of the screen), then do a Ctrl+C to copy and Ctrl+V to paste in wherever you want it to be.