Unfortunately, I cannot help. You need support from Wix on this.
You appear to have buried the Nabble code by itself in an < iframe> tag. The iframe appears to be launched through some complex JavaScript.
It's difficult, if not impossible, to work out how Wix constructs its site from the HTML behind the page.
Volunteer Helper - but recommending that users move off the platform!
Once the admin for GregHelp now deleted.