How to use 3D effects like Smoke

Please forgive my ignorance as I am way over my skis when understanding and using Hitfilm Pro 2017. 

I have uploaded a video and added some 2D effects and also a few basic things. Having said that, I can't seem to Incorporate the 3D smoke effect. I see it and selected it, I tried dragging it but nothing works.  I know I'm missing something. Any help would be appreciated. Thank you. 


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