This document describes how to change the keyboard input language in Windows 8.
Open the Control Panel:
Under Clock, Language, and Region, click Add a language.
Click the Add a language button.
Select the language you would click, then click Add.
In the lower right corner of the screen, press the icon that has the character sequence representing the current language. This will allow you to switch languages.
Press Windows + I or move your mouse to the bottom left corner of the screen and click on the gear icon.
You can switch the input language two ways:
Press Alt + Shift.
Click on the language icon and then click on the language you would like to switch to to switch input languages.