on a layer... Press CTRL+A to select everything that is in layer then Press CTRL+C to copy, Then go to the other destination and press CTRL+V to past...

Or maybe the render's Base is like that it won't appear normally... after pressing CTRL+V try to drag the render around maybe it will show up..

Or it has some Function problem then mate, Try this: Press File Tab> Place> Choose the Render> Click OK

Render is there to use.