How does one invoke "click to show/hide"?

Try looking at this link, it shows you exactly what I typed to make that post.

https://boards.straightdope.com/raw/965609/1562

ETA: You can do this for any post you see. Copy the link,

https://boards.straightdope.com/t/republicans-war-on-transgender-people-omnibus-thread/965609/1562

and replace the “/t/name-of-topic/” with “/raw/”

https://boards.straightdope.com/raw/965609/1562

That way you can see how they made the post.

~Max