Would you be willing to answer a few brief questions about PlayStation Forums?
i just got a ps4 for xmas and got my son a ps3 how do i get him a different user name but have him on my master account
Welcome to the Playstation Community Forums.
When you start your PS4, there should be an option to add an user. Choose that option and build his account from there.
On PS3, go to Users and "Add an user". Then go to the PSN section and make an account.