I have a text file in Test_1/testing.txt

DIM Stuff, myFSO, WriteStuff, source, number, description
  Stuff = "hello"
  SET myFSO = CreateObject("Scripting.FileSystemObject") 
  SET WriteStuff = myFSO.OpenTextFile("C:/Inetpub/wwwroot/Test_1/testing.txt", 8, True) 
  WriteStuff.WriteLine(Stuff) 
  WriteStuff.Close 
  response.write "<H2>Error Found, please contact Technical Support</H2>"
  SET WriteStuff = NOTHING 
  SET myFSO = NOTHING

This is the error message :
Error Type:
Microsoft VBScript runtime (0x800A0046)
Permission denied

Check the permissions for "testing.txt". Make sure IUSR_{machine_name} has permissions to write to the file.

i dunno how to check, pls can u teach me?

Right-click on the file, click Properties. Go over to the Security tab and look for the user to which Prissed refers.