How do you install wow addons?

Download a wow addon manager like wowmatrix. google Wowmatrix

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Inside your World of Warcraft game folder you will find a folder called "Interface". Inside is a folder called "Addons".

Addons provided on abovementioned websites usually come zipped, with the files in a folder with the addon's name.

Simply copy this folder entirely into the "Addons" folder. Make sure to quit WoW and restart it. At your character selection screen, at the bottom right, is a button "Addons".

Click it to see a list of addons you are using.

Make sure all addons you want to use have a tick in the box, and that the box "Load out of Date Addons" is ticked, in case you installed an older addon.

Log into your character, and the addon should now be active.