Hey guys,

So i'm a beginner at coding and I attempted to code code in order to do selected things if the check boxes are checked.
I have a total of 4 check boxes in my display, i need it so when 1 or 2 are selected it does the task already defined. If more than 2 are selected I would like it to come up with a message but unsure how to do that within the code i already have.

HTML Code:
Private Sub popping()
        If cbfirst.Checked = True Then
            If cbsecond.Checked = False Then
                If cbthird.Checked = False Then
                    If cbforth.Checked = False Then
                        firstpop()
                        firstpop()
                    End If
                End If
            End If
        End If
        If cbsecond.Checked = True Then
            If cbfirst.Checked = False Then
                If cbthird.Checked = False Then
                    If cbforth.Checked = False Then
                        secondpop()
                        secondpop()
                    End If
                End If
            End If
        End If
        If cbsecond.Checked = True Then
            If cbfirst.Checked = True Then
                If cbthird.Checked = False Then
                    If cbforth.Checked = False Then
                        firstpop()
                        secondpop()
                    End If
                End If
            End If
        End If
        If cbsecond.Checked = True Then
            If cbfirst.Checked = False Then
                If cbthird.Checked = True Then
                    If cbforth.Checked = False Then
                        secondpop()
                        thirdpop()
                    End If
                End If
            End If
        End If
        If cbsecond.Checked = True Then
            If cbfirst.Checked = False Then
                If cbthird.Checked = False Then
                    If cbforth.Checked = True Then
                        secondpop()
                        forthpop()
                    End If
                End If
            End If
        End If
        If cbsecond.Checked = False Then
            If cbfirst.Checked = True Then
                If cbthird.Checked = False Then
                    If cbforth.Checked = True Then
                        forthpop()
                        firstpop()
                    End If
                End If
            End If
        End If
        If cbsecond.Checked = False Then
            If cbfirst.Checked = False Then
                If cbthird.Checked = True Then
                    If cbforth.Checked = True Then
                        thirdpop()
                        forthpop()
                    End If
                End If
            End If
        End If
        If cbsecond.Checked = False Then
            If cbfirst.Checked = False Then
                If cbthird.Checked = True Then
                    If cbforth.Checked = False Then
                        thirdpop()
                        thirdpop()
                    End If
                End If
            End If
        End If
        If cbsecond.Checked = False Then
            If cbfirst.Checked = False Then
                If cbthird.Checked = False Then
                    If cbforth.Checked = True Then
                        forthpop()
                        forthpop()
                    End If
                End If
            End If
        End If
        If cbsecond.Checked = False Then
            If cbfirst.Checked = True Then
                If cbthird.Checked = True Then
                    If cbforth.Checked = False Then
                        thirdpop()
                        firstpop()
                    End If
                End If
            End If
        End If
        Delivery_Stack(Stack_Top) = "Empty"
        Stack_Top = Stack_Top - 1
        CopydeliveryStack()
    End Sub
If you require more of my code or information just ask.
Thanks for your help.