Help revoking a signature

[Robin Cooper]

I feel like this ia a dumb question, but I can't seem to find the
commands in my docs or the WinPT program.

How can I revoke a signature I have added to someone else's key?

-- 
robin.cooper at gmail.com
PGP public key fingerprint: 2EE2 8019 3B18 1720 960F  B57A C9C3 3CB2 86B1 4A38
Lookup @ pgp.mit.edu: http://tinyurl.com/yv438
Lookup @ pgpkeys.pca.dfn.de: http://tinyurl.com/87kju