DELETING E-MAIL, How do I Delete All read E-mails and Junk E-mails all at once rather than one at a time? Cannot figure how to "Delete All?"

How do I delete all read e-mails, deleted E-mails, Junk E=mails etc. all at once? (Delete All feature), rather than one at a time? Thank you!

Bob at ***removed for security***

Question about Outlook Express