Before you can access any online features of the PlayStation 4, the system software needs to be updated to the latest version. System software updates begin downloading automatically as soon as they are available, and an on-screen notification will inform you when it is ready to install.
You're signed out from all devices when you change your sign-in ID (email address). When you change your email address you receive an email to your old email address showing your new sign-in ID (email address).
Click Edit next to Sign-In ID (Email Address). You may need to re-enter your password for security reasons.
Enter your new email address and click Save.
You receive an email to your new email address asking you to verify your new sign-in ID. Click the Verify Now button in this email. You also receive an email to your old email address detailing the change.