K-Mail and OpenPGP plug-in?

[Ralph Crongeyer]

Hi all,

I'm using K-Mail but I have not used GnuPG and I keep getting this message:

Message was signed with unknown key.
The validity of the signature cannot be verified.
Problem: OpenPGP plug-in was not specified.
Use the 'Settings->Configure KMail->Security' dialog to specify the plug-in or 
ask your system administrator to do that for you.

How do I specify the OpenPGP plug-in?
I have GnuPG installed and keys generated and exported to a server 
"blackhole". What else do I need to do to get things working?

Ralph