From the extension, select the Stories tab, making sure you have selected the Client and Project for your stories.
Create a single story document (all text frames)
Create a single Story per document (selected text frames)
Create a Story per page
You will see a green T icon on each text frame that has been successfully added to your stories, provided you are viewing your InDesign document in Normal mode.
The text frames are also displayed as a list under your chosen story in the Stories tab. Clicking on the text frames list will highlight the said text frames in your InDesign document.
Note: Only text frames are possible to be added to a story.