Post didn't appears in 'slideshow' column (GlobalNews template)

Hi there. I’m using GlobalNews template from Instantshift. I’m having a problem, that post that should appears in ‘slideshow’ column didn’t appears as it supposed to be. It is under the ‘Today’s Highlight’ heading. According to the tutorial, I only need to tag the post as ‘slideshow’ but it didn’t works. Can someone help me to figure this out? Thanks.