My son refuses to poop on the potty. How can I fix this?

I am in dire need of advice on potty training. Help!
https://www.washingtonpost.com/lifestyle/on-parenting/potty-training-3-year-old/2021/11/16/3b9aa8dc-4274-11ec-9ea7-3eb2406a2e24_story.html?utm_source=rss&utm_medium=referral&utm_campaign=wp_lifestyle | My son refuses to poop on the potty. How can I fix this?