Well, you don't have a Thunderbird password (other than the Master Password, and you have clearly stated that is not the issue), nor a Thunderbird account. Your email account will have come from an email provider - probably your ISP, and you need to work with them to change the account's password.

Generally, if the password of an email account fails to log you in, Thunderbird will ask you to enter the new password, so you usually don't need to go out of your way.

However, you can review, edit and delete the passwords stored in Thunderbird.

In Thunderbird, go to Tools|Options|Security|Passwords and click the button "Saved Passwords". Right-click or double-click a login or password to edit it.

What leads you to say that you need to change your email account's password?

there is no tools/options at all

Press the Alt key to make the Menu Bar appear and use Tools there. When you are using he AppMenu button Options is a choice in the main menu so you do not need to use Tools. That Options works also.

got to the menu tools does not have options address saved files activity manager chat join chat message filters run filters on folders run filters on messages run junk mail filters delete mail marked import devleopers tools clear recent history

THERE IS NO OPTIONS

Airmail said

Press the Alt key to make the Menu Bar appear and use Tools there. When you are using he AppMenu button Options is a choice in the main menu so you do not need to use Tools. That Options works also.

You should read instructions closer.

And do not yell at me because you can't.

Ah, you're using a mac. Why didn't you say so?

Application User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:54.0) Gecko/20100101 Firefox/54.0

http://kb.mozillazine.org/Menu_differences_in_Windows,_Linux,_and_Mac

<tl;dr>? Thunderbird|Preferences

linux

in Linux version there is no such option

Read the post link to the chart for menus for your operating system posted above.

Next time you post to a thread stared by and answered for a Windows user you might mention your operating system.

Edit|Preferences.

Again, http://kb.mozillazine.org/Menu_differences_in_Windows,_Linux,_and_Mac

And it's better to start a new thread than hijack someone else's. The OP was using a mac; I hadn't noticed you were a third party.

Airmail said

Read the post link to the chart for menus for your operating system posted above. Next time you post to a thread stared by and answered for a MAC user you might mention your operating system.