How do i FIND MY tHUNDERBIRD EMAIL PASSWORD

There is no "Thunderbird password". If you're referring to your email provider's password, it ''may'' be stored in <Settings | Privacy & Security | Passwords | Saved Passwords>. However, depending on how the account's security is set up, you may see what's known as an "authorization token", rather than its password. If you're referring to something else, please clarify.