Here is a video walk through on how to install your form on your Wix Site:
Adding the form via your Wix Account:
To display the booking form on your Wix site, you will need to use HTML, this will allow you to embed an iframe (external code or components).
To add HTML code:
Click Add + on the left side of the Editor.
Click More.
Click HTML iframe, or drag it to the relevant location on your page.
Enter the HTTPS code.
Click Apply.