Delete Thunderbird. Open the menu of your operating system and choose Tools, then Thunderbird. Click the Thunderbird Menu icon (three horizontal bars) in the upper-right corner of the Thunderbird window. Select Account Settings from Options by hovering your cursor over it. Then, go to Account Actions and click Remove Account.
To modify someone’s email address, go to their Google Contacts and type the name of the person whose email address you wish to change in the white search bar. … After hover over the incorrect/old email address, click the checkbox. Select [Delete] from the upper-right corner of your screen.
To remove the incorrect contact/email address from your Address Book or Collected addresses: On ‘Address Book,’ click on ‘Collected Addresses,’ then choose the wrong contact. Delete or alter it and save so that when you type in a Write message, it will offer the correct spelling next time.