Your Kyte will use your device's language settings to select the country and its currency as it will the app's language, be it English, Spanish or Portuguese. To change the currency symbol you just need to tap on Settings.
Then on General.
If the currency you want is not the one selected, tap on Currency and choose one from the list. You can look it up by currency or country name.
All set! You have selected a different currency successfully and now your sales, receipts and catalog will use this currency symbol.