1. Open your web browser
2. Go to the URL And Type www.curse.com
3. Click the curse client tab then click download
5. Open it and click Get More addons
6. Search for the addon you'd like and simply click install.
7. Start wow.. then when you get to your character selection screen just click addons and enable any addons you'd like..
I hope this helped you.. if you have any questions leave it in the comments bellow.. Thanks