Select a piece of writing from a play, story or poem to satirize. You might want to first read a few satires. Try "Gulliver's Travels" or "A Brave New World" for examples of how to satirize a topic.
Note the standout features which make the characters or places unique, such as a look, strong chin or a turn of phrase. These features are the building blocks of satire.
Exaggerate this feature by drawing particular attention to it. For instance, in a play or movie, repeat the turn of phrase loudly or obviously, or for a story, use a signature phrase excessively, to the point of ridicule.
Complete the satire by turning the usual ending upside down. For instance, if the "hero" always saves everyone at the end, in a satire, have their idiosyncrasy cause everyone’s demise, or if people usually live “happily ever after,” have an add-on section which starts “until…” and have something comical such as “she had triplets…” or “he lost his job and started to drink…”