Question Customising my posts

[DivineDonut]

Hi, hi. I'm not a particularly code-savvy person, but I keep seeing people hiding text under cuts in posts where you can click the button and the hidden text appears...how the heck do I do that? Am I missing something obvious?

Grateful and bewildered.

typogateaux

 

[DivineDonut]

Oh that helps so much! Thank you!