What is Enable Inspection action in My Designs?

And why after I click to Share then nothing happens?

The “Enable Inspection” allows others to look at how you have constructed your watch face. It will look to them like it did when you were using Facer Creator except they won’t be able to save any changes that they make.

As for the “Share” option not working, that would be something that @Facer_Official would need to look into. The “Share” option appears to be broken in my Facer Creator also, even on published faces. It only seems to be working on the individual watch’s page.