[excel] EnterKey to press button in VBA Userform

You could also use the TextBox's On Key Press event handler:

'Keycode for "Enter" is 13
Private Sub TextBox1_KeyDown(KeyCode As Integer, Shift As Integer)
    If KeyCode = 13 Then
         Logincode_Click
    End If
End Sub

Textbox1 is an example. Make sure you choose the textbox you want to refer to and also Logincode_Click is an example sub which you call (run) with this code. Make sure you refer to your preferred sub