For more information on Stories and how they work, see the chapter on Stories and Messages.
To add a Stories feed to your Pulse section, scroll down to the bottom of your page where the Pulse feed is and click ADD PULSE SECTION.
These buttons will appear:
Choose one of the three layout options and the next screen will come up. If you selected one of the layouts with 2 columns, click od the ADD CONTENT button on whichever side you want your events feed to be.
Select STORIES and follow the instructions here.