How to install Chinese using WPML

Greetings !
Thank you for taking the time to read this !

Recently I installed WPML on our http://www.asiawide.asia website. We are using Kharma as our template. The aim was to have a bilingual english/chinese website.

The problem: Any chinese characters that we type on the website appears as question marks on the screen. Could you advise on how to resolve this matter ?

Thanks once again !
Kate