Custom currency (selectable)

Hi,

I’m sorry i’m choosing this kind of communication but I really dont know where to get support.

I’m having some difficulties regarding changing the woocommerce default currency (mine is “lei”) with a selectable currency from a custom form (as shown in the screenshot). Is there a way to do this? I dont know anywhere else where to ask as my theme developers sent me here to you.

http://www.microbazar.ro/imagini/woocommerce.jpg –> this are the values from the dropdown menu I want to use as currency – selectable one.

https://wordpress.org/plugins/woocommerce/