This is an AWESOME calculator I created myself (this project is NOT a remix, but you can make remixes of it) and here's what you do. Press A if you have an addition problem. Press S if you have a subtraction problem. Press M if you have a multiplication problem. Press D if you have a division problem. Press the up arrow to change the color of your calculator and the background, and press the down arrow to go to the previous calculator.
Credit to hammermikey for helping me! :)