[Users] SSH tunnel for Spamassassin?

[Jens Kjaerulff]

I am trying to get the Spamassassin plugin to work with Claws, appears
a bit of a challenge. I am informed by my mail server admin, that I
need to establish an SSH tunnel to have my local spamc connect with the
server's spamd, so that I can 'teach' Spamassassin what is spam and ham.

So how do I actually makes this SSH tunnel, using the appropriate ports?
I have been trying to follow directions at:
https://help.ubuntu.com/community/SSH/OpenSSH/PortForwarding

but I can't get it to work it seems. Some step by step instructions
from someone on the list in-the-know would be much appreciated.