On the Subject of Alphabetical Ruling

I used to rule the world - Cs would rise when I gave the word.

This module has nine buttons and two displays, one with a number and letter, and one with the stage number. This module has three stages. In each stage, look up the letter on the top display in the table below, and apply the instruction to the number on the top display. Modulo the final result by 10 and press that digit (if it’s zero, add 1).

When an incorrect number is pressed, the module will stay at its current stage and strike. Correctly getting through all three stages will solve the module.