Firebase for 2 player game

I now have my football app working 100% thanks to the great help I have received here!!!  

Currently, player 1 chooses their move, then hands the device to player 2 to choose their move, then there is an outcome base on those choices.  It is my understanding that I can use firebase to make this playable across 2 devices (each player using their own device)  is this correct?

If so...I will be asking for guidance on how to set that up.  

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There are two articles on Firebase in that section of this FAQ:

FAQ for FireBase

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Perhaps try this 
Firebase Chat with Interactive Drawing | Hossein Amerkashi's Blog 
for ideas.

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