...how do you ad your Wunderground weather sticker to your posts
Go to your WU page and there is a link below your broadcast box, "Add PWS Stickers to your website!"
Pick the sticker you want ( no animated flash movies allowed, the first two won't work here ) and copy the link.
Come back here and select Profile, click "Forum Profile Information" under "modify Profile"
Scroll down to "Signature" and paste the link from WU.
Scroll down some more and click "Change Profile"
That should do it!
If you have a problem with the code appearing properly, post the link from WU in here and we can have a look at it.