VBScript to create user accounts

I'm going to use the code below to create a bunch of user accounts. It obtains the data from an Excel spreadsheet I have. I'd like the script to set the option "User must change password at first logon" but don't know how. Can you tell me what I need to add to this script to configure that and where in the script it needs to go? Thank you.

' Script to create user accounts with. Obtains
' user information from an Excel spreadsheet
' ------------------------------------------------------' 
Option Explicit
Dim objRootLDAP, objContainer, objUser, objShell
Dim objExcel, objSpread, intRow
Dim strUser, strOU, strSheet, &_
  strCN, strSam, strFirst, strLast, strPWD
 
strOU = "OU=" & Inputbox("Enter the OU to add the users to:") & "," ' Note the comma
strSheet = Inputbox("Enter the path and filename of the Excel spreadsheet"
 
' Bind to Active Directory, Users container.
Set objRootLDAP = GetObject("LDAP://rootDSE")
Set objContainer = GetObject("LDAP://" & strOU & _
objRootLDAP.Get("defaultNamingContext")) 
 
' Open the Excel spreadsheet
Set objExcel = CreateObject("Excel.Application")
Set objSpread = objExcel.Workbooks.Open(strSheet)
intRow = 3 'Row 1 often contains headings
 
' Here is the 'DO...Loop' that cycles through the cells
' Note intRow, x must correspond to the column in strSheet
Do Until objExcel.Cells(intRow,1).Value = ""
   strSam = Trim(objExcel.Cells(intRow, 1).Value)
   strCN = Trim(objExcel.Cells(intRow, 2).Value) 
   strFirst = Trim(objExcel.Cells(intRow, 3).Value)
   strLast = Trim(objExcel.Cells(intRow, 4).Value)
   strPWD = Trim(objExcel.Cells(intRow, 5).Value)
 
   ' Build the actual User from data in strSheet.
   Set objUser = objContainer.Create("User", "cn=" & strCN)
   objUser.sAMAccountName = strSam
   objUser.givenName = strFirst
   objUser.sn = strLast
   objUser.SetInfo
 
   ' Separate section to enable account with its password
   objUser.userAccountControl = 512
   objUser.pwdLastSet = 0
   objUser.SetPassword strPWD
   objUser.SetInfo
 
intRow = intRow + 1
Loop
objExcel.Quit 
 
WScript.Quit

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