Pass ps4 what to do?

I bought a ps4 pro and I give the other one to my family. Now the question, if my family psn.de creates an account, can you log in to ps4 with this registered account? Or do I have to do all this via the ps4, the registration? How do I make a new admin on ps4? Thank you for instructions or explanation!

Please no unfriendly comments and the question is serious.

Just reset the PS4, it will be like new and you can register again, etc.

You can press: delete user. You can find this in the settings there, delete the user and register them on a new PS4