Select Embed a Widget to add an iFrame to your page.
Embed your code:
Click Enter Code.
Paste your custom HTTPS code in the text box.
Sometimes you might find that Wix does not allow for a widget or iframe to be embedded. This is a known issue with Wix. In this situation you should first copy and paste an empty character into the embed code, followed by copying and pasting the widget, then click apply. It should now work properly.