[tag-type] your spoiler message goes here.
type as much or little as you like.
use as many lines as you like.
yadda yadda.
[/tag-type]
using one of the above examples, simply replace the words "tag-type" with the word "spoiler"
note that the second tag has a / (forward slash), this denotes the end of the tag.
below is an example of a working spoiler tag:
⚠ SPOILER ALERT - (Click to reveal)
your spoiler message goes here.
type as much or little as you like.
use as many lines as you like.
yadda yadda.
you may already know this, but you can post actual copy'n'paste-able examples by using active markup
inside the markup you want to deactivate. for example, this