Find the Settings app on your iPhone and select it.
Scroll down and click General.
Scroll down again and click Keyboard.
At the top of the screen, click Keyboards.
Scroll down past your already installed keyboards and click Add New Keyboard.
You'll have the option to install any supported third-party keyboards, such as the keyboard here for the "Momento" app.
Other iPhone Keyboards
Most of these will be keyboards for specific languages. Scroll through these and select the keyboard you want to install.
- Once you select a keyboard, you'll be redirected back to the list of installed keyboards. Your new keyboard should now appear as a keyboard installed on your iPhone.
Click on the globe symbol at the bottom-left of your keyboard to switch between the different keyboards you have installed.