Check out how to install the plugin, and how to properly setup the WordPress for debugging.
Learn how to install the plugin
Learn how to enable Debug mode in WordPress
Check out information about the actions, filters and functions to extend and modify the plugin behavior.
Modify plugin using filters
Hook into plugin execution using actions
Functions to use from plugins or themes
And, here are some additional things you might wanna check out.
Full Plugin Changelog
Learn more about development process