Search for"Swiftkey" on the App Store and install the app. Install here: itunes.apple.com/app/swiftkey…
Important: you must open the app before you'll be able to use the keyboard.
Open The Settings app and tap on General
Tap on Keyboard
Tap on "Keyboards"
Tap on "Add new keyboard..."
Select "Swiftkey" under Third-Party keyboards
Now the keyboard is added! If you want to enable text suggestions you'll need to provide full access to the keyboard. Tap on the SwiftKey row to allow full access
Turn the toggle on for full access
Now whenever you open the keyboard next, press the globe icon for a couple seconds and the keyboard options will appear
Once you select SwiftKey the keyboard will change. If you haven't provided full access yet you will see a message about why word predictions aren't available
If you gave full access you'll see the word predictions as you swipe around the keyboard. Tap the globe icon again if you want to switch back to the regular keyboard. Happy Swiping!