Summary: 

To add an alternative currency apart from your base currency in your Unleashed account. 

Steps:

1. Navigate to Settings
2. Click System
3. Click Currencies 
4. Select the appropriate currency from the Currency Selection drop-down list
5. Enter the Buy Rate (amount of foreign currency you get for one of your base currency) and Sell Rate (amount of base currency you get for one of the foreign currency)
6. Click Save

Additional Information:

If you are unsure of the currency rate, make an estimation, this is only a default currency rate and can be edited in the transactions.

Your base currency is the one chosen when the company was registered. It cannot be changed. You will not be able to select a trading currency for your Customers or Suppliers without setting an exchange rate for it.