How i can change the keyring password?

I think this comes up for Ubuntu One users because Ubuntu One uses the keyring to store the login credential for the Ubuntu One service - recently when I was experimenting with autologin in order to do some boot speed tests I had to figure out how to change the keyring password myself. Here's how I did it:

Clicked on Applications->Accessories->Passwords and Encryption Keys

This opened the Passwords and Encryption Keys tool (sometimes referred to as seahorse), with the Passwords tab selected. This has one item called "Passwords: login", which is the login keyring. I right clicked on that, and selected change password. In order to make autologin work with zero keyring prompting, I set the password to blank, but you probably don't want to do that unless you want people to be able to access your keyring without anything stopping them.