Extended version of rich text editor is available right after installation of the tinymce pro module. To make it work you don't have to configure it, but there are some options that help you to manage the module. Below i will explain these settings, what these settings do etc. Just enjoy the list of topics below.
Where is the module configuration page?
Module configuration page is accessible from modules > modules section in your shop back office. Just near the module hit "configuration" button. This is a module configuration page. It is based on "tabs" to switch (left column) and contents related to selected tab. First section is "installation", second is "Editor settings" next is "Front office settings" and the last one is "updates".