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	Oder für schnelle Eingaben mit Enter als auslöser und ohne command button: 
Option Explicit
Private Sub TextBox1_KeyDown(ByVal KeyCode As MSForms.ReturnInteger, ByVal Shift As Integer)
    Select Case KeyCode
    Case 13
        Dim rng As Range, AV, R&, C&, LR&, S$
        Dim bereitsVorhanden As Boolean
        Dim tSh As Worksheet
        
            'set
                S = TextBox1.Text
                Set tSh = ActiveSheet
                With tSh
                    LR = .Cells(Rows.Count, 1).End(xlUp).Row
                    Set rng = .Range(.Cells(1, 1), .Cells(LR, 2))
                End With
                AV = rng.Value
                
            'nach vorhandenen suchen
                For R = 1 To UBound(AV)
                    For C = 1 To UBound(AV, 2)
                        If AV(R, C) = S Then
                            tSh.Cells(R, 2) = AV(R, 2) + 1
                            bereitsVorhanden = True
                        End If
                    Next
                Next
                
            'neue einfügen
                If Not bereitsVorhanden Then
                    If Not AV(1, 2) = "" Or Not LR = 1 Then LR = LR + 1
                    With tSh
                        .Cells(LR, 1) = TextBox1.Value
                        .Cells(LR, 2) = 1
                    End With
                End If
            'reset textbox
                TextBox1 = vbNullString
    End Select
End Sub
	  
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