A few people have been scammed on the site, Only use paypal to pay for items for sale by other members. If they will not use paypal, its likely a scam NEVER SEND E-TRANSFERS OF ANY KIND.
I'm not sure if you accomplished what you were trying to do. A while back I put together a pretty detailed explanation on how to add Fuelly stats. See attached link.
Looks like you have an extra closing URL tag in your code. Go into your signature and remove the [/URL] and then try it again. I think you accidently snagged it after the [/IMG] tag.