How do I change my password?
Open Settings > Security, enter your current password and a new one of at least 8 characters.
What if I forgot my password?
Choose Forgot password on the login page and follow the emailed instructions to set a new one.
How does an owner reset a user mailbox password?
Open the user mailbox under Email accounts and set a new password. Group mailboxes have no password of their own.
Do app passwords change too?
No. App passwords are separate. Revoke any you no longer trust in App passwords.