Nokia 5233 - How can I change the password for my email account on my Nokia device?

Select Menu > Messaging > Options > Settings > E-mail > Mailboxes and open the mailbox you want to change the password for, and select Connection settings > Incoming e-mail (or Outgoing e-mail) > Password. 

Note! This applies for the default email client included in the device software. If using Mail for Exchange or the Nokia Messaging email client, the password is changed in the respective client settings.