If you know HTML, CSS, JS, Smarty, and you want to make advanced changes to your theme, you can do so via the HTML editor. You will find it in the Layout tab.
In the main menu, you’ll see all the HTML files. Select the one you want to edit, make all modifications, and click on Save changes.
Remember that if you modify the theme yourself, the theme will lose its warranty and support.
Access to editing templates for login pages, customer registration, and other templates related to the customer account is only possible in the Premium subscription.