I've been wandering for awhile now how to make spoilers. I don't know how to explain.

 

Next to the media image on the formatting box is a letter like image (also next to the save button) click that then click spoiler (with flag) and write a title for the spoiler and then also write in front of the bracket saying /spoiler.
Example.
[SPOIL!ER="Title "] You would write here, but the exclamations wouldn't be here it was just here to show you.[!/SPOILER]
Finished design

 

OK thanks. please lock and archive.