How to read code coverage report (Cloverage)?

I’m new to code coverage tools and am trying Cloverage. It produces a nice HTML out put as follows:

This link to details on the individual namespace:

The trouble is, I’m not sure how to read this. What does the percentage mean and why, when there is an untested form mentioned in a namespace, does adding a test for that function not alter any of what I am seeing? When it comes down to it, if I share with Cloverage a goal of having 100% coverage (just humor me), how can I actually do things that will improve Cloverage’s happiness? How can I use it as a tool for the benefit of my code quality?

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