Help with code to have database userform add values to next empty row.

Go easy on me, this is the very first userform and vba project I have written on my own. How do I write the code so that when the add button is clicked it adds the values in the form to the next empty row. Right now it just owerwrites the values in row 2.

Private Sub cmdAdd_Click()
Cells(2, 1).Value = frmauditdb.lstSupName.Value
Cells(2, 2).Value = frmauditdb.txtPlantName.Value
Cells(2, 3).Value = frmauditdb.txtLastAuditDate.Value
Cells(2, 4).Value = frmauditdb.txtLastAuditScore.Value
Cells(2, 5).Value = frmauditdb.lstAuditType.Value

End Sub