Go to Settings
Select Login Settings
Choose User Management
Select Delete User
Pick the account you want to remove
Confirm the deletion
To remove a PSN account from the console, go to Settings
Select Account Management
Choose Activate as Your Primary PS4
Select Deactivate if needed
To delete the PSN account entirely, sign in to the PlayStation Account Management website
Go to Account Settings
Select Close Account
Follow the on-screen steps to confirm the closure