Tap on the Instrument you wish to open on the "Instrument Tab".

Select the Direction of the instrument you chose, either Sell or Buy.

Adjust the trade size in "Volume in Lot" (check the required margin for the instrument and what available funds you have)

Optional: you may manage your Risk Management by setting Stop Loss or Take Profit

Optional: you may open a Pending Order by selecting Open trade when rate is and select the price you wish the trade to open when reached.

Once done, Click Sell or Buy depending on the Direction you chose earlier, and the position will open.

Congratulations, you managed to successfully open a trade. You can find and monitor your open trades by going to the "Portfolio" tab and select "Open Trades" tab.