Do you really need EditText views ?
SecondProgram in the Beginner's Guide uses a Label instead of an EditText to avoid that the user interfers in the EditText view.
There are different possibilties, below a simple example.
You could add a Global variable holding the selected Lablel for example:
Dim lblSelected As Label
Add a Click event for all Labels, in this event set the global variable to the calling Label.
Sub lbl_Click
lblSelected = Sender
End Sub
In the btnEvent_Click routine replace lblResult by lblSelected.