How to script a button to equip (Attacks) Moves on certain keys ? [Answered]

For example : you got 4 keys ( R , T , Y , F)

and you have 4 buttons for those keys

-- Equip on R --

-- Equip on T --

-- Equip on Y --

-- Equip on F --

How do I make it so if I equipped "Fireball" on "R" and I want to change it to "T" so I click on the button -- Equip on T -- how do I make it so it changes the keybind of the Fireball and removes the Fireball from "R" and move it to "T"

-Show me the script for the changing keybind from one key to other key

Thanks for the Help C: