As of this writing, you have to have a premium site to add code through the Wix site editor. Here is my work-around to add Facebook page like button - can be used for other code as well. I used Facebook Code generator ( https://developers.facebook.com/docs/plugins/like-button/# ) then created a page on my site that is hidden from the menu and hidden from SEO, pasted the first code into HTML iframe on this hidden page, then pasted the second code (iframe code, for the button itself) on the page where I wanted the button. Make sure the HTML box (iframe) is large enough so the sliders are not visible so there are no sliders on your visible site.