IF YOU ARE ON THIS PAGE AND THIS SECTION SO THERE ARE SOME KEYBOARD SHORTCUTS THAT YOU SHOULD KNOW IF YOU WANT TO BE ABLE TO USE THIS PART OF THE SOFTWARE, SO YOU CAN ADD AS MANY NUMBERS AS YOU WANT, THE BOX WHICH IS SPECIFICALLY MADE FOR THIS SYSTEM IS THE THIRD BOX, SO YOU KEEP ENTERING THE NUMBERS AND PRESS ENTER ON YOUR KEYBOARD, YOU CAN UNDO BY PRESSING CTRL+Z OR COMMAND+Z AND YOU CAN REDO BY PRESSING CTRL+Y OR COMMAND+Y OR CTRL+SHIFT+Z OR COMMAND+SHIFT+Z, IF YOU WANT TO MODIFY A SPECIFIC NUMBER IN THE LIST OF SUM YOU HIGHLIGHT THE SPECIFIC NUMBER FROM THE LIST SHOWN BELOW THE BOX WITH PLUS SIGNS AND PRESS ALT ON YOUR KEYBOARD, YOU CAN MODIFY THE NUMBER FROM THE ON SCREEN INSTRUCTIONS THAT WILL SHOW UP, IF YOU WANT TO DELETE A SPECIFIC NUMBER OR NUMBERS FROM THE LIST YOU HIGHLIGHT THE NUMBER OR NUMBERS THAT YOU WANT TO DELETE FROM THE LIST SHOWN BELOW THE BOX WITH PLUS SIGNS AND PRESS DEL ON YOUR KEYBOARD YOU CAN DELETE THE NUMBER OR NUMBERS FROM THE ON SCREEN INSTRUCTIONS THAT WILL SHOW UP, AND THE RESULT WILL ALSO UPDATE AUTOMATICALLY BASED ON YOUR INPUTS.