Making Cuneiform your default keyboard. This second step varies a little from device to device and Android version. The screenshots below come from a Samsung Galaxy J3 running Android version 8.0.0 (Oreo).
Install
Tap Install
Select Settings / General Management
Select Language and input
Select On-screen keyboard
Select + Manage keyboards
Toggle Cuneiform on
OK the Google alert. Cuneiform adds words to your personal dictionary but does not send anything back to us. Our Privacy Policy has more information.