I can’t find passcode page
Where I find passcode page so I can change or chose passcode,
iPhone SE, iOS 15
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For the passcode, from the related article above.
- On iPhone X and later, or iPad with Face ID, go to Settings > Face ID & Passcode. On earlier iPhone models, go to Touch ID & Passcode. On devices without Touch ID, go to Settings > Passcode.
For the Yahoo email, have you looked in Settings/Mail/Accounts?