how to turn off two-step verification

Try reading the article you just linked to... including the section on how to turn it off.

How do I turn off two-step verification?

Sign in to your Apple ID account page.

In the Security section, Click Edit.

Click Turn Off two-step verification.

Create new security questions and verify your date of birth.

You'll get an email confirming that two-step verification for your Apple ID is off.

Can't be turned off, if it has already been activated over 14 days, if not, read the email that was sent to you on how to turn it off.

Not sure why you would want to do this, but there is an article on it here:

http://osxdaily.com/2016/08/17/disable-two-factor-authentication-apple-id/

Edit: this is no longer an option

You're thinking of 2 factor. That's a different animal.

Thanks Tim.