Cnmbook Linux How To Add A Language On A CnMbook?

How to add a language on a CnMbook? - cnmbook linux

I would be a CnMbook Netbook (Linux) as a gift and I want to use in my classes at school. However, half of my classes in Russian language are everywhere and can not I find a language to add my keyboard (it is easy to do in Windows, click the language icon and select "Properties"). The option I found is the language of the system, but that's not what I'm looking for (or call the choice between English anyway: P)

So I'm basically asking if there a way to add a language other than English (for writing in the word processor) on my Linux Netbook CnMbook.

Thank you!
Julie