Currency settings
How can I change currency settings?
You can find currency settings in the cart settings of admin area...
Here you can add edit or delete any currency settings...
You can add more then on currencies too. You can assign currencies to regions and countries and system will automatically change currency defined for that region/country when order placed from there...
You can define exchange rate by yourself or can use web service to make this process automatically too...
How can I make default currency euro for only European countries?
To do this, add euro as a currency and select region as European Union and set its exchange rate, either manual or through web service
Its detailed steps are:
Click on the currency setting in cart settings
Click on add new currency
Fill out the form
And save when finished.