After you have placed your trade you can navigate to "Positions" using the bottom navigation bar where you can monitor both your open orders, open trades and account metrics. Simply click the position to expand it and reveal actions such and "Close Position" and "Cancel Order". You can also deposit and withdraw funds here.
A few key terms to understand:
Available Balance: This is the capital available in your account for trading. Note when this hits 0 your account will be open for liquidation.
Total Account Equity: Is the total value of your account and trading portfolio. It Is calculated as follows: Account Balance + Unrealized PnL.
Total Maintenance Margin: Is the capital in your wallet set aside to keep your positions open.
Net Unrealised PNL: Is the total profit and loss from the positions in your portfolio.