A little learning.
Ready when you are.

Choose the right app, open it in your browser and use the installation instructions shown there. Primary and secondary have separate icons.

On your phone

Open the app directly
If you arrived through WhatsApp or another app, choose Open in browser first.
Follow the install prompt
Use the app’s Install option when offered. On iPhone or iPad, use Safari’s Share menu, then Add to Home Screen.
Let the first download finish
You need a connection for the first visit and installation. Then open the installed icon and check that the lesson you want is available.