Module has own configuration page available on modules manager page (modules > modules). You can "configure" module main features there, the way of how it behave globally and control the most important settings from addon's workflow point of view
As you probably know each product can have own unique "related products pro". To manage lists of "related products" just go to product edit page and go to "modules" section. You can manage there list of "related products" - create new, edit existing etc. You can create there lists of "related products individually for each item or create "global" blocks that will appear on many product pages.
This documentation section explains how to configure the module, how to use it and other configuration-related things. List of available topics you can find below