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Hello, Future Viewers!
If you have processed an order through your store, then updating the currency will be disabled. To enable the currency changer within Settings/General, will require the assistance of a Shopify support employee. Before the change can be made, you'll want to review the following:
Making any adjustments to your product pricing needs to consider the currency difference. You will also want to review your product pages, themes, etc. for currency information that might need to be adjusted. Note that refunds will be processed in the new currency.
If you have reviewed this information, and wish to proceed, then we'd ask that you reach out to our support via phones, chats, emails, or through social media on Facebook or Twitter as the Shopify Community Forum threads are not actively monitored by Shopify employees. By reaching out to our 24/7 support, you will receive a quicker response to making this change, which will result in a better user experience. For this reason, I will be closing this thread to all future replies.