How do you put a spoiler tag?

In the comment section of the manga you're reading?

click the check box

Yes

usually right under the title area, there is a text that says " Check this to show a spoiler warning" and if you check the box (turns blue) it adds the spoiler tag.

Seeing if this works,

>! Is it working i hope it works !<

IT DIDNT ┗( T﹏T )┛