Highlight the currency you want to change and click the Edit button. The Currency Information window appears, displaying the information you’ve already entered about this currency.
To update the exchange rate, click the Currency Profile tab and enter the new exchange rate in the Exchange Rate field. Keep in mind that your entry here should reflect the amount of dollars that one unit of this currency -- one French franc, for example -- will buy, and the amount of French francs one unit of dollars will buy. Verify these amounts in the fields to the right of the exchange rate.
Review the other information you’ve entered for this currency to be sure it’s current. When you’re satisfied with your entries, click OK.