To change your password for the forum complete the following steps.
1) Log in to your account.
2) Click the 'Account' link
3) Click the 'Profile' tab on the account page.
4) Click 'Edit account settings'
5) Type your new password in the 'New password' and the 'Confirm password' fields.
6) Type your existing password in the 'Current password' field.
7) Click submit.
After clicking submit you should stay logged in to the forum, and future logins will require the new password.