Go to the Finances section -> click on "Open new account" -> Choose the currency of your additional account: GDP, USD, CHF, EUR, PLN -> Add an account.
You can only have an additional account with our Premium membership. If you wish, you can upgrade your membership directly in your application -> click on the person icon in the right corner of the main screen -> click on Membership -> select "Upgrade to Premium membership" at the bottom of the screen.