Log in and goes back to wordpress.com after change URL…

Hi
I was offered a host place so I moved out of wordpress.com

my new site is: http://hyperballad.mabdese.net
my old one: http://hyperballad.wordpress.com

the problem is, when I’m in the new host place, at the General Setting. I changed both of my URL to http://hyperballad.wordpress.com

then whenever i try to log in again it always goes back to the wordpress.com dashboard, not my host site.

it’s like my site at mabdese has dissappeared…I can’t log back in at all.

I went http://codex.wordpress.org/Changing_The_Site_URL

but I don’t know anything about FTP, database or change wordpress at all.

my host provider set them all up for me, so I only know how to post entries.

is there a way I can solve it? can anyone help me ?

Thanks!