Just do a search for "Name=Group shortcuts" this should be G3F IXX the XX is that most menu_1024_768.ini files may be different mine is 21 look either side of this number (G3F I21) and you should find the one that matches the block in the readme, then edit!
If you still have problems let me know & I'll arrange for you to email the file, & I'll make the adjustments, & send it back.
Cheers.