hey um well i just got photoshop and i opened a canvas then i wanted to get my render and it came in a dif tab window

tho i clicked it then did ctrl + C and then paste it on my other tab that has the canvas set but the render doesn't appear =/

How do i copy a render to paste it somewhere else =/

ya i kno this is kinda sad but XD i dunno how to paste it on plz help thxs ;D