This is Rae from Shopify. Thank you for reaching out about this, and welcome to the Shopify Community.
The best way to contact our team directly is by visiting this link and logging in to your Shopify account. Then, type your question into the 'Ask about a topic' field and click 'Search'. Next, please scroll to the bottom of the page and click the 'Get help from the Shopify support team' button. Our contact options will appear here, and you can choose to reach out to us via email, open a live chat, send us a message on Twitter, or schedule a callback with a member of our team. If you're having any troubles with seeing these contact options, or selecting a contact method, please let me know and I can certainly help look into this.
In the meantime though, I'd really like to discuss your currency change further and provide more assistance with this. Can you please tell me a bit more about why you're looking to make this change?
It's also important to mention that there are some implications to be aware of before moving forward with changing the currency on your site. Please check these out here:
I'll reach out to you via email shortly to check in with you about this currency change and discuss the above implications. If you'd still like to proceed with this change on your site, please reply directly to my email and I'll be glad to offer more assistance.