Kindly show some screen shots of cover order.
Cover order is a market order and gets executed at the current market price and should not be used if you wish to manually specify the price. The below example from http://zerodha.com/z-connect/tradezerodha/zerodha-trader-software-version/cover-orders-for-higher-leverage shows a cover order.
The trigger price is the stop loss price and is used in case the market goes againt your analysis. In below example the trigger price is set at 6150 within the allowed range 6098.85-6255.2 mentioned in box besides.
cover order is for intraday trading.