Completing This IF Code

situation: if cell I22 in Sheet1 = "MFRHTC", a message box will pop up and give the user some info and at the same time ask if this is a Fed Ex shipment

if user selects NO, then nothing will happen

if user selects YES, then the user willl be directed to cell L15 in Sheet2 in order for them to input their ship to address

here is what I have so far:

Private Sub Worksheet_Change(ByVal Target As Range)
If Target.Count > 1 Then Exit Sub
If Not Application.Intersect(Range("I22"), Target) Is Nothing _
And Target.Value = "MFRHTC" Then
Msg = "Units will provide the following in order to have ammunition Fed Ex to HTC's " & vbCrLf
Msg = Msg & "" & vbCrLf
Msg = Msg & " POC" & vbCrLf
Msg = Msg & " Unit ship to Address / CANNOT BE A P.O. BOX" & vbCrLf
Msg = Msg & " Phone Number" & vbCrLf
Msg = Msg & "" & vbCrLf
Msg = Msg & "" & vbCrLf
Msg = Msg & "Input the required info in the Fed Ex ship to address Box"
MsgBox Msg, vbInformation, "FED EX AMMO INFO REQUIRED"
If MsgBox("IS THIS A FED EX SHIPMENT REQUEST", vbQuestion + vbYesNo, "SELECT EITHER YES or NO") = vbYes Then

End If

End Sub