I want to USD in Default not the websites default currency! Help!

Hello!

I purchased your theme, i set up everything, and its working fine.. but,

My websites default currency is HUF (because of our bank). and i want to convert the price in USD, this worked fine..

But i want that when people comes to website, they need to see first the USD currency not the HUF. Please take a look at the picture attached bellow.

Hope you can help me with this, with a little coding or something.

Thank you, Williams.