#1 - Feb. 7, 2010, 9 p.m.
If you are logged into the Battle.net Account Management page you can change the password from the
My Profile section. Right next to that title, you should see your current e-mail address. Below this are several options, including
Change Password. Click on it and it will ask you for your current password and a new one.
If you no longer have access to the old password you can use the recovery page from the login screen to set up a new one:
Password Retrieval
https://us.battle.net/account/support/password-reset.xml