Customize Influxdb plugin

I feel really stupid asking this question but I have spent six hours searching for this. I am new to this and I need to alter the influxdb plugin according to my needs but I can’t seem to get it running on the dev mode.
I downloaded the plugin from GitHub and ran it but when I go to the plugins page it says that support is already there and that is it. Any help would be really appreciated.
Thank you.