How do you change your keyring password on Lubuntu?

[Aere Greenway]

All:

Where I use the Ubuntu backup tool (deja-dup), it uses a keyring 
password.  The first time I used it, I just entered it (my password at 
the time).

But now I have changed my password, I would like to change my keyring 
password to match.

I did an Internet search on how to do it, but the instructions for 
Ubuntu don't work on Lubuntu.

How do I change it on Lubuntu (or delete it so I can re-enter it with 
the new password)?

-- 
Sincerely,
Aere