Head to the App Store and buy Swype (it's only 99 cents): http://appsto.re/us/RfQN2.i
Open your Settings panel and click General
Then click Keyboard
And then Add a New Keyboard
... where you should see Swype! Tap it.
Open up Swype and tap Activate
The app will direct you to tap the globe and hold to see Swype
- iOS 8 device