Akismet is not active. You must enter your WordPress.com API key for it to work.

Helllo list,

I first created a blog on wordpress:
http://beautifuloceansblog.wordpress.com/

My webmaster now installed our blog on http://blog.beautifuloceans.com/

But I keep getting the following message whenever I login to the blog on our server: ” Akismet is not active. You must enter your WordPress.com API key for it to work.”

I tried entering the API from the wordpress blog
http://beautifuloceansblog.wordpress.com/
…but that doe not work.

Now how do I get an API key for this to work?
Thank you, Stephan