To exchange currency on Sahm: Tap the "Portfolio" located at the bottom of the page. Tap on "Transfer" on the upper right of the Portfolio page. Select the "Exchange" option to access the currency exchange page. Select the desired portfolio for the exchange. Enter the amount of currency you wish to exchange and choose the target portfolio for the converted currency.  Enter your trading password and confirm the transfer. Exchange rate: Real-time rates in the foreign exchange market are provided by banks.