Form submission Mail can't be changed


unfortunately I have a problem with the contact form. When I look at the page settings under form there is neither an email address specified nor can I insert one. Above it says that is to insert a hosting but then comes an error message. ( Pictures attached )

Please urgent help…

Best regards

Here is my site Read-Only: [[LINK][1]
[1]: http://
[2]: Share a read-only link | Webflow University

On the left-side menu you can click the Plans tab to setup your site hosting.