How to Show the Bubbles in the Cfd-post
 

I'm making a gas-liquid simulation in the CFX.After managing, I want to create a gif that show the behavior of bubbles in the cfd-post. But I'm amateurish. I need to know some concrete processes about that(where should I click,etc).I would appreciate it if anyone could help me. Thanks a lot!
The gif is like this:https://m.youtube.com/watch?v=rkHPB0...&index=2&t=13s