I used a program called Medibang Paint pro, but I'm sure It's the same thing. Basically, if you have a windows computer, you go into your file explorer, and then find the spreadsheet download. Then double click it (I have windows 10, so I don't know if this would work for you too but ukno) and click on "try an app on this pc", then scroll down and find "try another app" or something like that. Then you can choose your program that you want to open it with. I hope this helped lol