Every user, especially a new one, should read about the
Basic Concepts
behind this plugin and it's usage.
Once you are comfortable with it, feel free to continue to the
Advanced Usage
section, which also covers the scenarios for user who already have their charts installed and would like to start managing them using the plugin.
You should definitely read the OpenCPN documentation about installing, managing and using charts, available in the online manual and in the help file bundled with your OpenCPN.
If you feel like there is a bug in the plugin, want to help with the development or feel like this documentation is not accurate, please visit us on Github and let us know.