Enter the amount to be charged and press the green button 
To surcharge (if applicable), select the card type logo
Select 
to Confirm or 
to Cancel
You can also use the green and red button
Tap / Insert / Swipe card, follow prompts
Remove card once prompted
The device will prompt if the transaction is approved or declined
Merchant receipt will automatically print
Select SMS, None or Print receipt for cardholder
SMS RECEIPT: Key in the mobile number and press enter
To learn more about accepting payments on your mobile device, you can find an online user guide for the Green plan here and for the Black plan here.