Reconfigure GreenEye pulse sensor AFTER install config

I have a Greeneye (GEM) energy monitor tracking a pulse count from my water meter. It is connected to Home Assistant through the HACS GreenEye Monitor integration.

When I configured the pulse meter during setup I said each pulse was 100mL - but home assistant energy module needs it in L … so I should have said 0.1L.

I cannot find how to change this - any help appreciated.

Also: when I click on “configure” within the GreenEye Monitor integration, it gives an error “Config flow could not be loaded” as shown in the picture.

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