I use the trading screen. If there are sufficient contracts (50 for $500) to fill your order it is accepted in full and you get a message immediately. If it is partially filled you also get a message. If no part is filled then your offer is available to anyone who wants to take the opposite side.
Bet on one side the other side takes a lead you dont feel comfortable and you want to buy back but no number comes up to buy back and that team keeps scoring and you still see no number to buy back. That is Tradesports.A Bookies Paradise of manipulation.