I lost the back to my 5s active galaxy Samsung phone were can I get another 1

You can try an official Samsung repair center or through their accessories site, but your best bet (and cheapest) would be to try to find it either online on sites like eBay or in 'regular' repair shops that might have that spare part lying around.
 
Welcome to the forums. I moved your thread to the S5 active forum for better visibility.
 

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