Just started and messed it up

I was on the options page when managing my blog and I was going to try to change the address. You know how the address is always like https://www.goodie.com/wordpress ? Well, I changed the “wordpress” part to a part of my site that already exists. Now I can’t get back in to administer and change it back. Does anyone know what I can do? Is there something back on the hosting page, a file or something that I can change?

I am worse than a novice. Any advice is appreciated. I know this is pretty basic and fixable just as long as I describe it acurrately…

Thanks!