Overview
Guardian's documentation lives here. This page is the short version.
Two apps, one pair
Guardian is two applications rather than one. The parent app, Guardian, goes on your own phone. The child app, Guardian Kid, goes on your child's device. The two are joined once, using a code shown in the parent app, and everything you do afterwards happens from the parent app.
Setting up
The getting started guide covers installation, permissions and pairing, step by step. Both apps are linked from the download page.
Getting help
If something here is wrong, unclear, or missing, tell us — the contact page reaches a person.