Once you purchase Steady Type from the App Store, you have to take two additional steps to use it as the keyboard on your iPhone and iPad. You have to install it on your device through the Settings app. Then you have to activate it when you are ready to type.
Installing Steady Type
To install Steady Type, take the following steps:
Open the Settings app on your iPhone or iPad.
Tap "Add New Keyboard…"
Tap "Steady Type."
Switching to Steady Type
Once Steady Type has been installed, you can use it whenever you want to type on your iPhone or iPad.
To switch keyboards, open an app that allows you to type and displays a keyboard. Tap on the Globe key in the bottom-left of the standard keyboard. A menu will appear. Tap on Steady Type. iOS will now display the Steady Type keyboard and you can use it to type.
To switch back to the standard iOS keyboard, touch the Globe key in the bottom-left of the Steady Type keyboard and drag to the Globe target.