Updating your email password in Thunderbird is pretty straightforward. Here are the steps:
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Open Thunderbird and click on the menu icon (three horizontal lines) in the top-right corner.
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Select "Settings" from the dropdown menu.
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In the Settings tab, type "password" in the search field.
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Click on "Saved Passwords" when it appears in the search results.
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Find your email account in the list, right-click on it, and select "Edit Password".
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Enter your new password and click "OK" to save the changes.
 
After you've updated the password, you might need to restart Thunderbird for the changes to take effect.