How to reset two factor authentication password?

There isn't one for Two Factor Authentication.

Two-factor authentication for Apple ID - Apple Support

Click on this link to read what to do "If you forgot your Apple ID password" --> https://support.apple.com/HT201487

or go directly to this link --> http://iforgot.apple.com/

Also read about "What to do after [or before] you change your Apple ID email address or password" --> https://support.apple.com/HT204071

If you mean a verification code:

To see how to 'Get a verification code and sign in with two-factor authentication', click here --> https://support.apple.com/HT204974