Lets say you like the Steelers and you want to post the play. You would then spell out the word Steelers, followed by the line -10.5, then wager amount.
So it would look like this:
Steelers -10.5 $500
Not,
I think the Steelers will win here, maybe cover, who knows probably won't play it but maybe will. We will see when the game is over and then I will say if I played it, what line I had, and how much I played it for. Probably will end up being a max play when they cover.