The simple steps to use a bitcoin ATM as far as I can remember is that for verification, your phone number is required. It is the usual verification type we are used to when we want to log into our emails from another device. After entering the code since you want it is bitcoin you want, you click on the bitcoin option in the window that pops up. In this next step, I opt for scanning the code which will send the bitcoins to my electronic wallet. The other instructions is easy to follow from here on.