You press the buttons (obviously). Oh, this is important; Do NOT cick the adding/subtracting/multiplying/dividing symbols until you have typed in BOTH numbers. *You can't type in 2-digit numbers (except for 10) because I can't figure out how to do that yet. If I somehow figure out I'll make an update.* It might not work if you don't press the buttons clearly.
Please let me know if there are any glitches.
