Nintendo Switch Manual page 40

3. Connect the console to the internet. While the
app is signed in to your Nintendo Account, link it
with the console.
A setup guide will begin when you first launch the
Nintendo Switch Parental Controls app. It will give
you detailed instructions on how to use the app.
If you don't have a smart device...
In this case, you can still set up some restrictions
using the console's Parental Controls menu.
How it works
1. Turn the console on.