PrimeBit WebTrader app is divided into three sections. They represent traders’ flow. First, you can analyze the chart. Second, check out the market depth with the order book, as well as see the contract details. Third, you can make a new order.
The order book is at the very center of the application.
The most attractive prices are in the center of the Order book (see the screen below). The numbers in red (1) are SELL offers, so the lower the price the more attractive the offer for a buyer. The numbers in green (2) are BUY offers, and here the higher the price the better the offer for a seller. 
Once you click any order in the Order book (step 1 below), it appears in the New order window. You can match it by clicking the BUY button (step 2) for sell offers (red) from the Order Book or by clicking the SELL button for buy offers (green) in the Order Book.
You can see your Open Orders in the window below the chart.
To open a new position, tou don’t have to match the offer from the Order book. You can ask for a better price (lower for BUY and higher for SELL) instead. In this case, your “Buy limit” order will appear in the “Order Book” of all the PrimeBit users, and also will be visible for you in the Pending Orders tab (screenshot below).
You can also make Market orders, which are going to be matched instantly against existing orders in the Order Book. Just pick the side (see the screen below), select the “Market” type (step 1), and the number of contracts you want to buy (step 2), and click the BUY or SELL button (step 3). These orders are matched instantly, and you can see them in the Open Orders tab.
If you have any problems, let us know.