In order to solve your issue, I suggest you have a look at the code below.
For Each iradio As HtmlElement In WebBrowser1.Document.GetElementsByTagName("input").GetElementsByName("Firewall.SelectedLevel")
If iradio.GetAttribute("checked") = True Then
Label1.Text = iradio.GetAttribute("value") & " is checked"
The following image shows the result of the code.
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