For each bottle ordered, just press the "+1" button (visible on the bottle label). The lid will move and you can hear the characteristic opening sound (bang), this will indicate that another bottle has been added.

There is also (in the menu) the option "-1" (subtract a beer), if you accidentally added one. If you want to reset the count, just select the option "New account" in the menu.

You can consult the total number of beers consumed at any time, to do this press the "Total" button.

This version also has the "saideira" checkbox: when you click on the checkbox, a beer is automatically added to the total. It is not possible to add another one until the check box is disabled / deactivated.