This tutorial was made on iOS, but it should be similar on Android.
1. Look Up: herok12 on the App Store
2. Download Hero - Students App
Download this specific app. The other app is for schools.
3. Notifications Settings
Once the app is downloaded, run it for the first time. You will see this prompt if you are using iOS. Choose Allow.
4. Log In with Username and Password
You had to have already created a username and password on herok12 for this to work.
You will see your name and barcode if you signed in correctly.