Help, I can't get into my admin

I’ve done something very stupid. In the settings I’ve changed the url where wordpress is, normally its youdomain.com/wordpress I should have changed the url of my site, but I didn’t. Now the system thinks that wordpress is at the roots and not in the dir wordpress. So, I can’t get in anymore.

How can I fix this? Is this saved to the database?

Really could use some help!