Click on the center column at the desired price to set a price alert.
To place an alert on the DOM left click in the center grey column by a price to display the Add Price Alert window.
Select the criteria and click Ok to display the icon on the DOM. Refer to the Figures on the left.
The open positions average price display by an arrow. It displays on the Ask when the contract is short and on the Bid when the contract is long. This displays the number of contracts open and identifies the price.