I just got Zoo Tycoon for my Nintendo DS lite, and I keep reading about cheats that in order to do them you have to change the guests names to certain names; how do you change the guests names? I didn't recieve an instruction booklet with my game because I bought it used. All of my guests say, "Guest 01" or so on and so forth. None of them have names. Will someone please tell me how to change the names of my guests so that I can put in the cheats?