If you want to open the touch keyboard manually (without clicking on the text field or other typing area), do the following:
Push from the right edge of the screen to the middle, and then click Settings.
(If you are using a mouse, please point to the lower right corner of the screen, then move the mouse pointer up, and then click Settings. )
Click the Keyboard icon.
Click Touch Keyboard and Handwriting Panel. Select the up arrow to select Chinese.