You can do so by pressing the diamond with the exclamation point on the top bar of the text area, or type it out like so:
::: spoiler Label here
spoilered text here
:::
With your comment, it would look like this:
CW: serious war crimes
!There was a video a while back of some Russians ripping off a Ukrainian soldier's testicles with a pair of pliers. They had it stretched out behind him like a piece of gum. Somebody thought this would be really funny to post on a SFW forum, so now I have that image stuck in my head forever. At least there's less soldiers being raped than at the start of the war. Videos of that were popping up all over the place.!<
FYI, you can spoiler text in posts and comments.
You can do so by pressing the diamond with the exclamation point on the top bar of the text area, or type it out like so:
::: spoiler Label here spoilered text here :::
With your comment, it would look like this:
CW: serious war crimes
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