find the program then sniff the packets while your doing what you are planning on editing. then find the right packet and open it, it's usually encrypted so if you don't have a working decrypter then your stuffed basically

save the packet and once you've decrypted it edit what you have to edit in it, then when you need to send the packet again the program your using should have a send packet option unless it can't.
im pretty sure this is what hes refereeing to as MQ2

some programs GG will stop.