ToolBox -

Click  by the Settings tab and select Payment Methods.

You can see the section called “Currency Settings”. 

Currency Symbol

This is a character used to represent your transaction currency. For US dollars, the default is $ but any other value can be used (such as USD, CAD, ¥, etc). You can specify a different currancy than the defaults by entering it the text input field.

Base Currency

The drop-down menu lists possible currencies.
Base currency must be the same as your payment gateway or PayPal’s base currency. For example, if your payment gateway and merchant account is in US Dollars, then all your pricing and your base currency must be in US Dollars within Rezgo.
Setting base currency is very important if you use payment gateway or Paypal. To avoid any transaction error, make sure to set base currency properly.