rebeccasremedy on "wordpress.com to mydomain.com"

Hello,

I want my blog http://rebeccasremedy.wordpress.com to transfer to http://rebeccasremedy.com. How do I do that? I have already purchased my domain, installed WordPress, exported my old blog and imported it to my new blog. I don't know what to do from here. If people go to my old blog, I want them to be re-directed to my new one.

Any suggestions?
Your help is much appreciated!!