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How do I change an e-mail account password ?

We use btopenworld as our e-mail provider via the bthomehub and AppleMac G4 iMac.
Both the wife and I have POP accounts and I want to change the password on mine. I went into the email accounts page and deleted the existing password ( so old long forgotten ) and typed in a new one in both incoming and outgoing boxes. I have now locked myself out and cannot receive any mail at all. How should I have changed the passwords ? I have done something wrong !

Help please from any apple guru !

Thanks

Brian