SOLVED How to mark something as a "spoiler"?

[Chromo & Martini]

"I've seen your life and it sucks because, you'll die at the ending"
that is, how do i mark the "die at the ending" part as an spoiler?

 

[NOUS]

Use

[spoiler]TEXT HERE[/spoiler]

Spoiler

die at the ending

 

[Chromo & Martini]

Thanks.