CindyO, here's a tip about using the spoiler tags. Put your text in between the two tags like this (I am misspelling the word "spoiler" so that the forum software won't interpret it as a true spoiler tag):

[spioler]This game is addictive![/spioler]

If you're using the Full Reply Screen, you can type your note, highlight (select) the part that is a spoiler, then tap/click on the spoiler button and it will "bookend" the selected text with the spoiler tags.

I think all of this is waaaaaaay easier with a desktop PC and a mouse, but it's possible with a mobile device and your finger.