How to use Nvidia Flex to create Cake Cream?

I spent whole week just successfuly install Nvidia Flex with UE 4.14.3, due to many problem such as Github register and Visual Studio. But nevertheless I can finally get it to work.
How ever the problem is I am new to Unreal and I cannot find any Flex tutorial to learn. But I still need to use it to create “Cake Cream”.

Is “Cake Cream” a static mesh or a particle emitter? Because I am currently working on a VR project allows people to decorating cakes by using fresh cream. Thank you very much.
P.S It would be great if can also provide YouTube tutorial links about Flex.

Have you dealt with this issue? I also spent a lot of time to install it (via Github), but so far only the demo can run.