Follow the below steps to close out your position/sell your instrument on the web and app platform:
Web Platform:
Select the account you used to trade:
Go to your dashboard and select "Open Trades"
Click on the dropdown of the trade you want to close
Click on the 3 dots under "Action"
Select "Close Positions"
On the App:
Select "Accounts" on the bottom menu and scroll down to the holding you would like to close under "My Positions"
Click on the instrument you would like to close.
Select "Close" on the specific position you want to close
Select "Close Position"
The next screen you are presented with will allow you to close your trade in full or partially according to the number of lots.