When creating a platform with Forento, the platform currency is set to USD as per standard. United States dollar will be displayed as the placeholder currency for any pricing sections, and assigned as currency once you connect to Stripe or PayPal as your payment gateway.
After having connected a payment gateway to your platform, you'll be able to change the currency setting on the customize platform page, here.
You'll find a list of different currencies. What currencies are available for your platform depends on what payment gateway you have, your bank account, and your business location.
Note: If there's no currency setting available on the customize platform page, it's most likely because you haven't connected to a payment gateway yet. You can get set up with Stripe or PayPal here, on the Payments page.