Open the Wix App Market. Search for Wix's HTML iFrame element. Add a new HTML iFrame to your site.
Open the HTML Settings window. Make sure Mode is set to HTML code. Paste this exact code into the box. Update and close the settings window.
The iFrame will now contain the Button App. Click the Button App to reposition your App. Click and drag a corner to resize your App. When you are finished making edits, simply Save and Publish your website in the Wix website editor. If you visit your live website, the Button App will be visible. You may edit the App right in the live, published Wix page.
To edit your Button on Wix:
Visit the live Wix website and click the gear icon in the upper right corner of the Button App.