Go to the Quick Start Guide here.
You can also get to this Quick Start Guide in the WordPress backend by going to Help -> Getting Started. It is meant to quickly give you the basics on how to use the My Calendar plugin.
After having activated My Calendar plugin a new default “My Calendar” page will automatically be created. The Calendar Page Location can be changed through the Settings > General screen.
Go to My Calendar page and notice at the bottom the My Calendar Display Options (click the arrow to open). This is a way to quickly set the default of how your calendar will look on the frontend. Here you can explore various views and what is seen. Go to My Calendar Display Options documentation to learn more about these options.
Learn about how to Add Events.