There's 8 red boxes (4 pairs) so you can do up to a 4 stage gearbox in the calculator. More often than not you'll only have a 2 or 3 stage gearbox, so you can leave the last set at 1:1.
Looking at the calculator, it seems like you plan on putting the miniCIM in a Versaplanetary with two 10:1 stages, and then an 18T gear on the output of the Versaplanetary driving an 84T gear connected to the arm. If this is the case, you have filled the calculator out correctly for this scenario.
If the scenario I said above was indeed correct, I'd caution you to maybe switch to a less powerful motor. The miniCIM is overkill for this application, which isn't in itself bad, but it also exceeds the load rating for a 100:1 Versaplanetary. You can find the load rating guide here:
http://content.vexrobotics.com/vexpr...s-20151221.pdf