URL change –> Site unavailable

For some reason i just tried changing my page’s URL in General Settings from sticky-bottle.com to thestickybottle.com. I’m not a WordPress expert, and i don’t own thestickybottle.com, so I have no idea why I even tried.

The problem now is, my original site looks all wrong and when I try to log in as admin on the site to change back the URL, it says that the site is unavailable.

So I am now stuck with a site which i can’t log in to and that doesn’t work. What do i do to fix it?

Help would be appreciated