Thank you for this.

So if I need to change my 'amazon' password, I press 'generate different codes'. Then when I need to use my amazon password, I come back and click the 'generate different codes' to retrieve the new password?

What is the best way to use this for a service where the password frequently changes?

If you need to change your 'amazon' password, you click 'generate different codes', yes. That action will be remembered in your browser's local storage. So when you need to use your amazon password again, it will automatically advance and generate the correct password.

But if you come from a different browser, you'll need to click 'generate different codes' again to advance to the correct password.

For services where the password frequently changes, I don't think there's a very practical way to use this. At least not across several different browsers.

> Your verification code is 120179. You can use it to verify your seed password in the future.

What does this mean? And how is it used to verify a password?

The "verification code" is a 6-digit hash calculated from the seed password. The idea is, you'll become used to recognizing the same verification code whenever you type your seed password - then you can quickly spot if you ever make a typo in the seed password.