If you are targeting about the Panasonic Lumix FZ300, that camera was first supported in Lightroom CC 2015.1 or Lightroom 6.1. It will not be supported in the version that you have. You can either upgrade or use the free DNG converter 9.1 to create DNG copies that you can use with what you have now.
Jim, Thanks so much for your help. Regarding free DNG. When I import into Lightroom 5.7 , do I just import using DNG in Lightroom 5.7?
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When you use DNG Converter you can select a folder containing raw images and can convert them to DNG
Then import that folder in Lightroom
Download link for DNG converter:-