It's easy.
Just send a message from the old address to:
listserv.maelstrom.stjohns.edu
with the message:
unsubscribe blind-hams
in the body.
Then, from your new address, send a message to the same address,
listserv.maelstrom.stjohns.edu
and in the body of the message, write;
subscribe blind-hams
That oughta get it done.
--Rick