To begin, press the green flag. You will be asked what your account name is (choose anything). Once answered, a credit card will be assigned to your mouse. Move the card to the green "card" slot. This will activate the display and it will provide instructions on the pin code. For this ATM your pin code is "1234". If you press the incorrect pin number, you will be asked to press "clear" and enter a new set of values. After that is complete you will be told to either withdraw or deposit (completed by pressing either sprites at the bottom of the display). To complete the withdraw or deposit select the arrow symbols that will appear next to the display. Finally, by pressing the arrow symbols it will either decrease or increase the total amount of money shown in the "total balance" located at the bottom right.
