how to edit add'ons ?

[hadish]

hi ,How and with what program and softwares xenforo add'ons can be edited?
I want to make a change to a add-on

 

[sucre13]

Notepad++​

 

[BattleKing]

hi ,How and with what program and softwares xenforo add'ons can be edited?
I want to make a change to a add-on

hadishVisual Studio Code