All North American full-thumbboard BlackBerry models 5XXX, 6XXX and 7XXX series, have the backspace key at the end of the second row. (Exception of the 71XX series)
Section number 3 is fully correct in the first place with no modifications needed, but I see your error now in section number 5. It is regarding the Enter keypress. I forgot to change the word "backspace" to the word "Enter" in section number 5. Section number 3 and number 5 are nearly identically worded, section 3 is for the backspace key and section 5 is for the Enter key, but one occurances of the word "Enter" was the word "backspace" by accident.
Fixed (one word changed in section #5)