Sacred Haven of Debauchery

Noticed. But I don't understand what and how to write there. Can you explain?

Go to the topic and write your nickname there using any font and color (you can leave it as default). Choose one of the four elements and write it in the topic. Send the author of the topic a picture or description in a private message of how you want to look in the alternative universe. It can be absolutely any creature, for example, a sofa with a parrot head and a deep fryer butt in a checkered shirt.