Fear not!
Simply, start a spoiler tag. -> [sp0iler (Misspelled for obvious reasons.)
Then, insert and 'equal to' sign and then the spoiler title -> [sp0iler=This is text] (<- Don't forget to close it with a ']')
Insert text to be including inside the spoiler.
Don't forget to close with a [/sp0iler]
When done right, it should look like..
That wasn't so hard, was it?
