Changing your password for Thunderbird email is important to ensure the security of your account. Follow these steps to update your email password:

1. Open Thunderbird on your computer.
2. Go to 'Tools' and select 'Options'.
3. Click on 'Account Settings'.
4. Choose the account for which you want to change the password.
5. Click on 'Server Settings' under the selected account.
6. Enter your new password in the 'Password' field.
7. Click 'OK' to save the changes.

Remember to use a strong, unique password to keep your email account secure. Changing your password regularly is a good practice to protect your personal information from unauthorized access.