If you use limit orders you add liquidity to the market. That's why once your order is matched, you will receive a maker fee bonus.
Here's an example of PrimeBit's order book.
Choose "BUY", set "Limit" as your order type, set the "Quantity" (number of PrimeBit contracts). The activation price, in this case, will be 8737.0 (the highest price in on the BUY side in the order book) or lower. Double-check the order details and press the "BUY" button at the bottom of order window.
The order is now visible in the "Pending Orders" tab.