Hi @ap1,
Webview is used to show external websites, you need to put a URL link there. It works similarly to a browser. Just in case - not all websites are displayed correctly using webview, some restrict it.
Generally speaking, I don’t think it is possible to put iframe code inside Adalo app. You can put some HTML code using HTMLRenderer component from marketplace, though it doesn’t allow any scripting languages to be used.
Best regards, Victor.