External templates allow you to reduce the code in your main HTML page, and reuse it in multiple places.

If the code is particularly complex and tricky to implement, the template download might include a separate "ReadMe" file that explains how the code works and how to customize it.

If you are experienced with HTML and CSS, you can select "Edit HTML" to directly customize the code of your template. Otherwise, click the "Customize" button to launch the Template Designer.