This tutorial will help you understand you how to change the WooCommerce Shop Currency.
To change your WooCommerce shop currency settings go to your WordPress admin dashboard → WooCommerce → Settings → General → Currency Options and select your desired currency from the currency drop down.
Detailed instructions can be found on the official WooCommerce page → https://docs.woocommerce.com/document/shop-currency/
Video Tutorial:
This tutorial only applies to themes that comes with WooCommerce.