To enjoy Chat and Video you need to download and install the following :
A. On your computer/laptop:
1. Adobe Flash player: https://get.adobe.com/flashplayer/
2. Adobe Shockwave player: http://get.adobe.com/shockwave/otherversions/
B. On your mobile:
Download the "Puffin Web Browser " from your mobile Apps store, as it has the flash player inbuilt.
NOTE: Puffin browser is available for desktop/laptop also. If you use it then you need not download and install the above Flash and Shockwave players!
Enjoy Chat and Video calls now !!!