Hi there @Joy1993!
Don here from Shopify.
Thanks for letting us know your requirement here in the Shopify Community.
In order to get this account setting changed securely for you, you'll just need to reach out for support via our help centre.
There you'll be able to verify your identity and we'll be able to access and discuss your account securely and help to resolve this for you.
Are you still setting up your store and working towards launch?
Do you know what else you need to work on next for your store apart from this currency change?