Then select the amount you want to sell. If an ATM is posted early without the tag it runs the risk of confusing customers and hurting your rating. Afterwards, you can insert cash and press Buy after you are done. Currently there are more than 20 different styles of bitcoin ATM, but the general principal of how to use one of them remains the same. A ticket will come out with a cryptocurrency address in the form of a QR code. You can add html content, image etc..