ok man , go to YouTube - How to make cheat codes in NitePR (inf Ammo, health etc.) and read the description , it gives a step by step description to help you ,

----Added 27/9/2009 at 10:56 AM----
ok here was the description
Some Codes you make might become DMA which means they will work only once, I haven't done much coding in a long time so I wouldn't know how to help you guys, sorry.

Value Q and A by
cotylachney101

Q="i found the values but i dnt know wat to do wit them... how can i change them to make em higher"

A= i did a lil messing around with the value.dec. and u can make it higher by typing in a higher number for Value.Dec. and u can also search money in value.dec and change it to whatever you want.

Follow this Guide while watching the video to find out how to make codes for nitePR
Guide:
Step 1: Find Unknown Value - 32 bit
Step 2: Shoot 2 times
Step 3: Continue to Find Unknown Value
Step 4: Change 0=Same to 3=Less
Step 5: Wait for it finish
Step 6: Do anything you want but DO NOT RELOAD!!
Step 7: Change 3=Less to 0=Same
Step 8: Let it finish
Step 9: Reload but do not move a step
Step 10: Change 0=Same to 2=Greater
Step 11: Shoot 2 times
Step 12: Change 2=Greater to 3=Less
Step 13: Do anything but DO NOT RELOAD!!
Step 14: Change 3=Less to 0=Sames
Step 15: Reload
Step 16: Change 0=Same to 2=Greater
Step 17: Shoot 2 times
Step 18: Change 2=Greater to 3=Less
Step 19: Do anything but DO NOT RELOAD!!
Step 20: Change 3=Less to 0=Same
Step 21: Reload
Step 22: Change 0=Same to 2=Greater
Step 23: By this time the search results would mostly stay the same, so press X on as many codes as you want. Press O when you press X on them.
Step 24: Go to PRX
Step 25: Change HZ to 15
Step 26: Press X on your selected cheat
Step 27: Turn it on
Step 28: Happy hackig :)
if you need any help message me = )