In order to exchange currencies in the application you need to make a transfer between your accounts. First of all make sure you have created the account in the given currency. We offer accounts in 5 different currencies: EUR, USD, GBP, CHF, PLN. If you want to exchange currencies go to "Transfers", click on "Between my accounts" and select an account you want to make a transfer to. Executing the transfer exchanges currency.
We invite to consult the following article:
How can I open a new USD/GBP/CHF/PLN account?