Online:
- Sign in to Netflix.com.
- Hover over the profile icon in the top right hand corner.
- Select Account.
- Select Change email or Change password.
- Enter your new email/password.
On the Sky Q box:
- Sign into the Netflix app.
- Scroll or press left on your Sky Q remote to reveal the menu.
- Scroll down to Settings and select.
- Select Change account email or change password.
For yourself I would suggest doing it on the Sky box, should be easy enough!