Welcome to Android Central! If your device has Samsung's enhanced clipboard, you usually access it by tapping one of the keys to the left or right of the spacebar on the Samsung Keyboard (I think it's to the left). You might have to long-press the key to get the option. But my understanding is that many of Samsung's more recent devices only have the basic clipboard function, which you can read about here:
http://forums.androidcentral.com/am...w-s/639479-guide-understanding-clipboard.html