@Julieanne21_
Is this the pin to access your Sky emails (where you have posted) or something like the pin required to access age restricted content via your TV package ?
If the former I would change your login password:
https://skyid.sky.com/resetpassword/
Then make sure your account has not been accessed so go to Settings (the screw icon on the right hand side) > More Settings > Filters and remove anything that you did not setup.
Then go to Settings > More Settings > Mailboxes > Your email address > Reply-to address
And again remove anything here that you did not setup.
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