Doing a search for World of Warcraft Add-ons will bring up a huge variety of sites. One of the more popular ones is Curse.com, which allows you to browse add-ons by category, such as your class PvP, or economy. Simply choose the one you want, and download it to your computer. When you log in to WoW, click the add-on button on the character screen and make sure that the appropriate add-ons are selected. The changes should take place once you log in to your character.
World of Warcraft secrets - The down side to add-ons.
The biggest downside of using add-ons is that they have to be updated with each and every patch. Depending on the add-on, this can take days or even weeks after the patch before it is updated, if it gets updated at all. If you have become overly dependent on a particular add-on, you may feel quite naked without it.
Some add-ons can also slow up your user interface, especially if you have a slower computer or a slower connection. Some may also interfere with some of the aspects of the game for instance; you could experience a glitch that prevents you from using a quest item appropriately. In these cases, you will need to weigh your experience with the add-on to the game performance, and take out any that aren't worth the hassle.
As with anything else you download, you should also make sure that you use a trusted source for add-ons to avoid unintentionally downloading viruses, Trojans, or worms.
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