I am a trainee and my trainers barely taught me how to use the credit card machine with the cash register. I have no idea what to do when someone gives me a credit card (pathetic, right?). Can you please help me…

I know the first two steps

1. Press Credit (or giftcard)
2. Swipe the card
3. Press enter (a little of the reciept comes out)

I am kinda confused at this point…what do you do? please help me!