How to use "Spoilers"

It has come to my attention that a lot of you seem to forget or don't know how to use the spoiler seeing as there is a lot of people quoting images and not putting them into spoilers. (I think all large images should be in a spoiler in the first place anyways...)

Here is a image that shows you where the Spoiler is.

Spoiler:

After you click other you'll see a list of items. Just click "Spoiler" and there you go.