to copy and paste on a windows computer ( dell or non apple computers) look at your key board find the key labled ctrl that key is the first key you need to press. then make sure you know where the C key is and the V key is. to copy and paste simply highlight the image you want to do ( make sure there is no copyright) and hold down the ctrl key then press the C  key. open new tab ( Or have it open to the place you want to copy. this also works in messages it just turns out a bit weird.) then click to make sure the blinking line is there and then press V there you have it.

apple is the same thing however  you press the command key instead of ctrl.

windows 

you may not have a ctrl button but you do have a button with the windows logo on your key board that is your keyboards command or ctrl. 

chineese keyboard im not chineese idk