Okay, I feel like a n00b asking this, but how do you insert spoilers? Also, I really think there should be a pinned thread explaining this, because I think lots of people would like to know.
http://empireminecraft.com/help/bb-codes Oh, and Crazy's version for when you get the annoying duplicated spoilers bug: http://empireminecraft.com/threads/forum-formatting-guide.18400/
Oh don't worry, I had this question pretty recently too. You just put [spoiler]Spoiler text here[/spoiler] EDIT: Ninja'ed