Eh?
I assume you mean avatar. Just get a screenshot of your character by pressing the Print Screen key in WoW (it's to the right of F12) which creates a .tga file in your WoW/screenshots directory. Open this using your favourite image editor. If you don't have one, I'd recommend the free Paint.NET for Windows -
www.getpaint.net
Then just use the selection tool to cut an area out of the screenshot no bigger than 120 by 120 pixels. Copy it, paste it as a new image and save this on your hard drive as a JPG. Then use the
My Avatar page to upload the image. Simple!