Open the app drawer
Find the app you want to add
Press and hold the app icon
Drag it to the Home screen
Release it where you want it placed
If the app is missing, open the app store and reinstall it
If the app is hidden, check the hidden apps or disabled apps settings
If using an iPhone, swipe to the App Library, press and hold the app, then tap Add to Home Screen
If using Android, open Settings, then Apps, then enable the app if it is disabled
If the Home screen is full, remove an app or widget to make space