The HEAD tag contains a website's background information. We automatically add a 'description' tag and a 'title' tag for SEO purposes, among other reasons, so you don't have to do this yourself. You may want to add code here for advanced applications, such as a 'verification code' or a 'tracking code'.
In the Editor, click on Settings on the top navigation bar.
Go to the Advanced tab.
Enter your HTML code in the HTML in HEAD tag field.
Click on the Save button.