The Currencies tab allows you to add as many currencies to the system as you'd like.
Click on + ADD CORRENCY
The exchange rate of your main currency (home currency) should be 1. The Season Begin and Season End fields will contain the dates between which the exchange rate is applied. The Code defines the currency code, i.e. EUR for Euro or USD for US dollars.
example: 1 USD = 0.85 EUR
If the main currency is EUR, the exchange rate set for USD is 0.85.
You may edit or delete your entries by checking them and using the Actions section.
Expired currencies may be archived id you edit the currency and check "Is Archived".
This means this rate will not be used in Prices for Exchange Rate.