mail password settings not showing

I upgraded to Sierra earlier this week. Today when I changed the password on one of my e-mail accounts I went to the normal mail>perferences>accounts and there is no "password" setting available anymore. I also checked mail>accounts and there is nothing showing there to set the password. As an aside, my IMAP servers are not showing anywhere - only two SMTP servers. Seems to me like something has changed there and I don't know what. Will try to find info on the Sierra FAQs pages but hoping someone can direct me to the correct location. Also checked System Preferences to no avail. Any suggestions?