I am unclear on your request. If you changed the password for the account, Thunderbird will prompt for the new password. Please provide more information.

Spectrum required a change in Password for my RoadRunner email account. After the change, I was not able to send email through Thunderbird. How do I locate the tab required to modify Thunderbird so it is accessing my email with the correct password. Note: I have found instructions that mention a security tab and also an options/preference tab. Neither of these locations are found within my Menu.

The menu named 'options' is now named 'settings' Normally, if the stored password is incorrect, Thunderbird will prompt for the new one. Are you not receiving error message about password? Anyway, on your question: To reset the password, - click settings>privacy&security - click the 'saved passwords' button and then click 'show passwords' - now, highlight the rows (normally two) for the account and delete them Thunderbird now does not have the password and should prompt for it. (Optionally, you could select 'edit password' instead of deleting the rows, but I prefer letting Thunderbird prompt for it.)