I don't know which keyboard is factory installed on your phone, and if you just mean the swiping gesture or the actual Swype keyboard. Open the settings within the keyboard (if you can't find it on the keyboard itself, go to settings-language and input and select your keyboard). You want to look for Gestures, and make sure swiping is checked. If you are talking about the actual Swype brand keyboard, you need to download it from the Google Play store.