Begin by creating a new Discussion Topic. Next, click on "Generate Discussion Ideas"

Select the number of ideas to generate and (optionally), instructions for tone/audience and what level of Bloom's Taxonomy the discussion will align to. Also select which pieces of content in the module you'd like Lumi to "read" then click on the blue "Generate" button.

Select one idea from the list then the blue "Insert" button:

Edit your discussion's title, point value, settings, etc and click the blue "Save and Close" button when finished.