You can just follow these steps, they are simpler.
1)Install 1.13 pkg file from the link provided
2)Go to Comgenie's Awesome File Manager
3)Navigate to right side
4)Go to: dev_hdd0 > game > your code which is written on the side of your MW2 cover > USRDIR
5)Now when you're in USRDIR move your arrow so it's pointing to patch_mp.ff
6)Go to the left side
7) Go to usb_0000 (its something like that) which is your usb

Find where you put your patch and make sure the arrow is pointing to patch_mp.ff
9)Press O (circle) then press the start button to copy the patch
10) Quit Comgenie's Awesome File Manager and do the data transfer
You now have the modded patch
BE WARNE

If you do the data transfer, the PS3 which you're sending the patch to will be formatted, all the game saves deleted