Seriously. The POS walks you through each step. There's a button to call an attendant for help, if you don't want to walk inside and ask how to pump your gas. Or you could stand there and watch other customers do it.
I'm having a memory of trying to pump the gas for my dad when I was a kid. I got confused about what to do, so after completely filling up, I ended up swiping the credit card again after finishing the purchase, leaving the machine open to being charged again. My dad stood there and yelled at me, and the whole time I thought, I don't know what I did, so when he's done yelling I'll just gonna go ask the attendant.