Hi! The path it says in "install help" says to put your addons wherever you installed the game.
I played years ago, and had to remind myself where mine were put so that they would show up. My game does not work when installing addons to the suggested path:
Program Files/World of Warcraft/Interface/Addons/<whatever your add on folder is named here>/<add on files>
**Since my computer at home has more than one user on it, but I installed WoW on the "default" path, my addons don't show up unless I put them on the path:
Users/Public/Games/World of Warcraft/Interface/AddOns/<whatever your add on folder is named here>/<add on files>
Figured I would post this in case everyone else installed on the "default" path, but you use a user on your PC when sharing at home with others.