There oughta be tutorials on this somewhere, but I think I did it by hand -- used "Manual" mode to create the grid and added answers line-by-line. That's also how I got the answer blocks wide enough to show the overlaps of different presidential and vice-presidential terms as they died or resigned and were replaced.
I'm really bad at understanding computers, could you maybe explain it to me, but like I'm five years old, or I could collaborate the quiz with you to help, if you can