How to use SSH tunnels with pgAdmin?

I’m suffering from a lot of dropped connections between pgAdmin and my PG databases, even after very brief inactivity.

Your documentation at http://www.pgadmin.org/support/faq.php#ConnDrop says:

…you could use a SSH tunnel for PostgreSQL traffic. SSH can be configured to keep the channel open at all times, so that database traffic can be passed even after a prolonged period of inactivity. For information how to configure this, ask your SSH package's documentation for "tunneling".

My problem is, I don’t know how to set up pgAdmin to use my SSH package (PuTTY).  At least I think that’s my problem.  Can you help?

~ TIA

~ Ken