Keyring password clear/reset

Start at Applications on the top panel.

Applications > Accessories > Password and Encryption Keys

A window will open in the "Password" tab

Select your keyring by clicking on it

Right click on it and select "Change Password" to change or "Delete" to remove existing password

Here's the link with the full instructions, including terminal:

http://ubuntu-tutorials.com/2010/01/16/reset-gnome-password-on-ubuntu/