In your Instant Website Builder navigate to
Left Toolbar > SETTINGS > SEO & Meta TagsScroll to the lower part of the new window, where you can find an area for your Google Analytics ID, Google Tag Manager, and Facebook Pixel Code.
When you save changes, it's live, but none of these may work for you until you're logged in as website administrator, to test these settings, use another browser or log in from your website first.
