Currently we support UK pounds sterling (GBP) and US dollars (USD).
To change your currency, go to the Package page (you can click its name in the top left corner of your screen), then view the Setup tab, and finally select the "Currency" menu option. Select the currency you want to use.
It's important to note that changing currency doesn't convert from one currency to another. If you select a new currency, don't forget to update costs you've already entered, replacing them with ones denominated in your new currency.