-------------------  Subscribe to SIGs ------------------
Select the SIGs you want to subscribe to and add them to
your personal subscription.  The only SIGs you can read
are ones you have subscribed to.  The full list of sigs
is obtained with the "all" command.  You display your
list of SIGs with the "list" command.  You add a SIG to
your list with the add command, like: "add email".  And
you remove a SIG from your list with the drop command,
as in: "drop email".

Note to send and receive email you must subscribe to the
email SIG.
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