Stories are the circles at the top of your screen on the home page of the app.
Or, go to Tomer's account and tap his circular avatar which probably has a pink circle around it.
(I rarely look at regular feeds on Instagram, just stories. They tend to be a lot more interesting)
I've posted the picture above. It's not from his regular feed, it's from his story. You can't see someone's story unless you follow them, and not on the web only on the app. It's still there.
(Again: I'm not stupid!)