How do I register my trial version? what key code do I use?

I am trying to register my trial version to the standard version, but the registration id they have sent me is incorrect. Is this the code I use to register?

You are supposed to receive

You are supposed to receive the key in the receipt email right after the purchase. But our registation server went down and I didn't notice that. Sorry about the delay. The key has been sent to you by email. Paul