Your store needs to have a base currency setup before it you can start selling. If you store theme allows multiple currency, you can add more currency and setup the exchange rates.

To setup select Settings -> Exchange Rate

Click the Enter New Store Currency.


Select the currency that you require.

Is Default Currency

Check if this is the base currency that will be used in the store.

Exchange Rate

The exchange rate ratio based on $1.00 of the base currency.