Cheat Code

Hello
My request is about Packet Editor, I have make a draw for better comprehension of what I want do x)

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So, thanx for reply and help about how I can do that !

I don't know your level in C/C++ coding.
What you need to do in a MITM (Man in the middle) attack.
When your computer is sending back the packet, you need to intercept them using a c++ packet sniffer library (a fast search over the internet give [Only registered and activated users can see links. Click Here To Register...]).
Once you have intercepted the packet, get the hex of it, apply a regex or whatever search function, get the position of the bytes in the string to replace and inject yours. Send back the packets.