I cannot download the sample file so I went to this without it.
I get a runtime 2465 error debugging to: Me.Parent.URL = strURL

1. I have webbrowser on form. It is webbrowser4
2. I have subform with continuous form.
3. On SUBFORM  I selected on current and inserted
Private Sub Form_Current()
MsgBox Model
    Dim strURL
    strURL = "https://www.stockinthechannel.co.uk/Search?q=" & Model
MsgBox strURL
    Me.Parent.URL = strURL
    Me.Parent.WebBrowser4.Object.Navigate strURL
End Sub


Msgbox x 2 are fine also when I pass from one item to next. It changes the model just error on the  Me.Parent.URL = strURL

4. I added field on from and subform Model

5. So for some reason not accepting  Me.Parent.URL = strURL I commented this line and it worked.

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Reply from Alex Hedley:

The tip mentions having two controls on your Form. First being the WebBrowser control called "WebBrowser1", the second being textbox called "URL".
If you don't have a Textbox called URL on your Form then the code will break, also rename your control to 1 or the code to 4.