lost login keyring

[john shea <jshea109 triad rr com>]

My password for Evolution has disappeared! I simply forgot it and each
time I access my email I get this Login Keyring asking me for my
password.
Can someone help me how to either rid myself of this annoying window or
put another password into it?
I went to Systems/Administration but did not find a Keyring tab.

Thanks.

john