The freeze Level is the range between the current market price and the trade's price you try to place (pending order). If the freeze level from your broker is 10 it means that if current market price on EURUSD is 1.3050, you can only place pending orders @ 1.3060 or 1.3040. All you have to know is if the freeze level is > 2 pips, you can consider that your broker is really bad!!!