First, add the Best Currency Converter Shopify app to your store from the Shopify app store. Installation is the same as with any other app; after you integrate the app with your store, you will be taken to the plan picker. And once you choose a plan, you will land on the settings page.
First, you must change your money formats.
From your Shopify admin, click Settings, then click General:
Scroll down to the Store Currency section, where you'll see your Currency settings:
Click Change formatting.
Find the HTML with currency and the HTML without currency formats:
In both text fields, copy and paste <span class=money> in front of the formatting text.
In both text fields, copy and paste </span> after the formatting text:
The first step in the setup is to Select Currencies. In this section, you can choose if you want to enable or disable the app, turn on Auto Switch -> The currency will automatically change based on your customer's location, even though you're not on the Shopify Plus plan.
After that, you will see the list of all available currencies. This app allows you to add more than 160 currencies, and one of them is bitcoin; include as many as you want.
In the next step, you can customize your switcher a little, usual stuff. The next section is Price configurations. In this section, you can choose if you want to Display Currency Code, Remove Decimals and Round Decimals. This is useful since no one wants to see $3.14159 when shopping online.
As you probably already know, Shopify won't allow you to make changes to your Checkout page, and your customers can only checkout in your shop's main currency, which can be an issue. So that is why the developer of this app figured out to show the notification on the cart page that is meant to inform your customers that Shopify only allows them to checkout in your shop's main currency. Clever, right?
Another interesting feature of this app is Show Original Price on Hover - so If your customer hovers over the converted prices, he will still be able to see the price in your shop's main currency.
Save your changes and reload your store to see how it looks. You should be able to change the currency on your store after this.