Head to the Invest Section on your Moneybase and type the name of the instrument you would like to trade in the search bar.
More than one option may be available such as for e.g Apple is available on the Frankfurt exchange in euro well as on the NASDAQ exchange in Dollars.
Click on BUY and complete the details of your order including buy/sell, number of shares, order type and validity.
Ensure that the Order Preview toggle is enabled. You can now click on Place Buy Order and your Order Preview will be shown. This will also display the trade value of the order, current holding of shares, available cash balance on the order screen.
Please check this screen thoroughly to ensure that the order details inputted match your intended instructions and then proceed accordingly.
Should you wish to modify an order, tap on Orders, select the active order you wish to amend, and click on Modify/Cancel.