WOW is a game by Blizzard Entertainment, accounts are managed at their site Battle.net, so please go there:
https://accountkiller.com/en/delete-battle-net-account
URLS:
http://www.worldofwarcraft.com/
Please note that AccountKiller.com is not associated with the business listed on this page. AccountKiller provides easy-to-understand instructions and guides on how to cancel charges and relationships from the list of businesses on our site, we have no affiliation with these businesses.