I'm sorry I may seem like a noob, but how exactly do I do that spoiler thingy where you click on it and it opens?

[ SPOILER="hi"] yo [ /SPOILER ]

Write that without spaces,and it will look like this.

Or if you mind typing those tags, you can simply click icon present at the rightmost side of editing options. Click that and it will ask about the spoiler option (i.e the 'hi' part of above example). After entering that, it will automatically write the tags for you. Now you can type what you want to show after the show button is pressed.