File Directory Fail

Oh please help me!

I just did something very stupied.
Within the admin panel,
in the settings I have changed the wordpress home directory.
I dont know if I have called it correctly, something like that.

now all its a mess up!

the website is: http://dkmotion.com
this also should be the home adress (or whatever) of the file directory …
instead of http://dkmotion.com I chose http://dkmotion.com/urban-movements

now all its messed up and I am not able to access the admin panel any more.

Maybe the solution is easy as hell,
but I did not get it …

thanks so much for your help,

David