Log into your OpenCart admin panel. In your browser address bar type http://yourdomain.com/admin. If you have installed your Opencart under a subfolder ‘store’, the above URL will change to http://yourdomain.com/store/admin. Log in using your username and password.
Navigate to System > Settings. Click the Edit button:
Select the Local tab. It is better to enable the Auto Update Currency option. That will automatically set the conversion rate for each currency in your store:
Navigate to System > Localization > Currencies. Click ‘Add new’ to add a new currency:
Feel free to check the detailed video tutorial below: