Thanks for your cooperation cheers RickyWard

In Thunderbird you do not 'change' an email address. You create a new existing mail account for the new email address. If you are talking about your 'Firefox Account' which is used to logon to all forums etc. * https://support.mozilla.org/en-US/kb/change-primary-email-address-firefox-accounts PS: Strongly advise you do not post your email addresses or other personal stuff in a public forum as anyone can see it. Suggest you edit the question to remove them.