You can change the currency of your store by going to Shopify Settings --> Store Details -> Store currency:
However, please note that all the prices in your Supliful account will be displayed in US dollars (USD), and your card will be charged in USD. Therefore, if your added card is in any other currency, there might be additional charges due to the bank's currency exchange rates.
Please contact your card-issuing bank to get more details on their exchange rates and service fees.
!NB! Since Supliful currency can not be changed, it will stay in the USD.
However, if you offer other currency in your Shopify store, for example, British pounds,
you will need to put your retail price on the Supliful as it would be in pounds, not USD: