This page explains how to activate your console as your primary PS4, which can be useful if you have skipped this step during the creation of your PSN account. By activating your PS4 you will thus allow the other user account to benefit from the various features of the PlayStation Plus service, Remote Play, purchases made from the PlayStore...etc
The procedure is as follows:
- Go to Settings > PSN.
- Select Activate as your Primary PS4 > Activate.