I've removed the domain mapping upgrade and issued a $13 refund. It can take 1-2 weeks for a refund to be reflected on your account.
If you let me know a little bit more about what you're trying to do, I'd be glad to help.
It looks like you already have a self-hosted WordPress site here: http://www.eatjapanchannel.com.
If your goal is to move that site over to WordPress.com, here's a guide:
https://en.support.wordpress.com/moving-a-blog/#moving-from-wordpress-org
Once your site contents have been moved over to WordPress.com and it's ready to go live, you can then re-map the domain, and update the name servers to point them to WordPress.com, following these instructions:
https://en.support.wordpress.com/domains/map-existing-domain/
If you have any other questions, just let us know.