Your A.A.W.M (Appli Auto Weight Manipulator) had finally arrived into your house, you took no time in setting her up and getting her to work. You hear the Appli Auto Jingle play from her

The machine's display screen turned on, showing the face of a woman with black hair and yellow eyes

Laurrey: "Greetings, i'm Laurrey, how would you like to change your body today ? Choose weight or height (If you choose weight you can also choose a body part), then a number, then if you want to Add, Subtract the amount from you/it, then press the "Confirm" button. If you don't like the changes, press the "Undo" button"

there we're many buttons in the machine, 3 big ones labeled "Confirm" "Weight" and "Height", a row of smaller ones labaled "Plus", "Minus" and below those, a number pad, and a body part selector. There was also a "Undo" button

What buttons do you press ?