Log in to NGA Forum-User Center next to the avatar in the upper right corner, and select-Forum User Center. There is a signature column below the avatar, and a small line on the upper right of the signature box reads: [change signature]

You can change the contents of the signature bar by clicking. If you want to add your own World of Warcraft character as a signature,

Code is server name] modify the server name and name.

Change your signature, submit it, and it will be changed.