@john.curtis9
To do this you need to turn two step authentication off then you can set it up again with your new number.
To turn off 2FA sign in with the recovery code so at the login select "can't sign in with the code" link. You'll then be asked for the recovery code.
When you signed up to 2FA you were given a recovery code so if you didn't make a note of it then check the email you were also sent.
Help can also be found here on how to turn this off and/or change your number:
https://www.sky.com/help/home/sky-yahoo-mail/two-step-verif/articles/two-step-verification
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