Option Explicit
Sub blankAfterConfirm()
Dim rng As Range, fnd As Range, addr As String
With Worksheets("sheet3").Range("C:C")
Set rng = .Find(what:="confirm", After:=.Cells(1), MatchCase:=False, _
LookIn:=xlFormulas, LookAt:=xlPart, SearchOrder:=xlByRows, _
SearchDirection:=xlNext, SearchFormat:=False)
If Not rng Is Nothing Then
addr = rng.Address(0, 0)
Set fnd = rng
Do
Set fnd = Union(fnd, rng)
Set rng = .FindNext(After:=rng)
Loop Until addr = rng.Address(0, 0)
fnd.Offset(1, 0).EntireRow.Insert
End If
End With
End Sub