Styles

Your plugin says

These styles (just the classes) are imported from your current theme’s editor-style.css file. However some themes don’t include that file. For this case follow the instructions on TinyMCE Avdanced’s settings page to add your own editor-style.css file to your theme.

As in where can I set this plugin to load my custom css file, it is not named editor-style.css.. NOWHERE are there instructions for one to load their own css file.. where exactly is this done?