Follow the instructions then in our earlier posts mate and change byte 18 from 4B to 4C or 24 to 25 or 26 depending on what it already is (just effectively add 1 to the value), copy the new string and paste it into the new code box, click do it and you should have rear drls. The last bit in byte 18 sets the value for rear drls.
EDIT Should mention that in real binary, bit zero is right hand end (last) and bit 7 is "(first) on the left hand side. All numbers in all systems count on the r/h/s, only increasing the digits to the left as required by the count. But I've seen people calling the last bit number 8, or number 7 but its not.
People also though may say the 8th bit which in text terms is the last bit, so just watch out for that when coding from instructions online. Save your original code in notepad on the computer, then change stuff and you can always put it back then. If a coding attempt works for you, copy the new string (long code) and paste that into notepad on a separate line, reminding yourself with a bit of text as to what it did, which controller you were in etc. Helps later when you have to change things later.