Step 1: Download Kodable
Kodable is a free download in the iOS App Store.
Step 2: Log In
Launch Kodable and tap on the green 'Parents Start Here' button.
If you have an account, you can log in to an existing account to automatically download your profiles. If you do not have one, you can register from here.
Step 3: Select your profile
The profiles you have created will automatically be downloaded. You can create a new profile or tap on existing one to start playing.