Default [Q] How do you edit the blank keys on the "numbers-only" keyboard

You know how the keyboard switches to a 10-key style number pad when you're in a numbers-only field (such as entering PIN for lock-screen)? The LG one has blank keys where one would expect to see period, comma, dash. I heard that it prompts you to customize those blank keys the first time you use it, but I don't remember seeing that and I don't see any options for changing it now.

I'm using Malladus 1.2.2 ROM and the LG keyboard.

This is how it looks: