How do I change my PSN online ID on PS4?

1. Go to [Settings] > [Account Management] > [Account Information] > [Profile] > [online ID].
2. Enter your new online ID.
3. Follow the on-screen prompts to complete the change.
4. Once you have completed the change process, you will be signed out from all devices.

Will it cost me to change my online ID?

You can change your online ID as many times as you want. The first time is free. A charge applies for additional changes. PlayStation Plus members receive 50% discount for changes to their online IDs but membership is not required to make changes.