Stop outlook express from auto login

[cowboychincs]

Howdy... trying to h elp my father... when he had AT&T set up his email account, the technician set up outlook express to automatically log him into his AT&T Email Account when Outlook Express was opened... how can I guide him into changing it where it actually prompts him for his login and password... as some of my father's guests use his computer and he does not want them automatically going into his email account... many thanks...