remapping - How to add a Pause/Break key to a keyboard that doesn't have one?

I would like to make my right Alt key into a Pause/Break key, because my keyboard doesn't have one.

I would like to know where to go to edit this information, and how to save the changes.

Please, don't tell me something like "use [this program]" unless it is very easy to use and understand. Also, the usual code RAlt::^CtrlBreak doesn't work for my Hegemonia game.