Every order starts the same way: choose Buy or Sell, then pick the Yes or No side. Nothing else in the ticket accepts input until a side is chosen, because a price only means something once there is a side to price.
Say Yes is asking 62¢ and you buy 50 shares. The order costs 50 × 62¢ = $31.00. If the outcome happens, each share settles at 100¢, so you receive $50.00 — a profit of $19.00. If it does not happen, the shares settle at zero and the $31.00 is gone.
Sizing by Order Value gets you to the same place from the other direction: enter $31.00 at 62¢ and you get about 50 shares.
The Yes and No buttons show the best price currently on offer for that side — the price your order would fill at. That is why Yes and No rarely add up to 100: the gap between them is the spread between the two sides of the market. The Chance column sits between the two and is the market's view of the probability.
Orders execute immediately or are cancelled. Nothing sits waiting on the book, so a limit below what anyone is asking will not fill — it is cancelled instead.
When a limit is too low to trade, the panel says so before you commit, shows the price that would fill, and offers a one-tap button to use it.
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