The currency information is shown based on your Shopify currency settings. Here's how to check it out:
Go to the Shopify admin -> Settings -> General page: https://shopify.com/admin/settings/general
Scroll down to the "Store currency" section and change the currency on that section.
Note: You might be prompted to contact customer support to change it because after your first sale, the currency is locked in.
Once the currency has been changed on your Shopify admin, the app will pull out that information, and it will take about 15 minutes for the app to detect those changes. Then, it starts displaying the pricing with your new currency symbol.
Note: If you are using Shopify Multi-Currency, the templates will automatically display the amounts and currency in the customers chosen/used currency. The editor may show the "main" store currency during the editing process, but the final templates will display the correct currencies when Shopify send the emails to the customers.