Installed new blog, dashboard takes me to old blog

HI

I installed a free blog on wordpress.com.

Then I bought a domain name and hosting service and installed wordpress there. I created a new blog (has the same title but different domain).

When I try to log in to the new blog, it takes me to the dashboard of my old blog at wordpress.com. I can’t get the dashboard of my new blog on new new domain.

Pls help?