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Gotcha! @ullioh When you write your post there'll be this icon called "spoiler"

spoiler tutorial3.png

Click on it and you can name the title and add the text inside like this.

spoiler tutorial 2.png

It'll only show when you click on it. Like this

spoiler tutorial.png

Hope it helps! And have fun writing!

wow the truth is I had not seen that icon.... thanks for helping me

Happy to help!