I think it's best there isn't a way to unbind items. It tells you when you go to bind them they can't be unbound. Plus there are guardian scrolls available to keep from dropping your items instead of binding them. Also, say someone gave their info away/sold the account (which people do ) and they unbind the gear, sell it, blah blah, the owner wants the account back for whatever reason and then comes crying to us blaming us cause we unbound it and wants their stuff back. It'd just be a big chaotic mess. :/
u had to think about it before u bound ur items.(anyhow gaurdian scrolls are free here, there's no need to bound anything)