Find the Play Store Icon and click on it.
Search for "Google Keyboard" in the Search field.
Select the Google Keyboard.
Press the Install button.
Once the Keyboard is downloaded, Open it.
You will now be prompted to Enable the new Keyboard in the device settings. Then you will be asked to Switch the new keyboard as your the main input method.
If you have any additional questions on changing keyboards, please call our Support Team at 1-800-566-6940