Ive just recieved my naza light and installed it in my deadcat. I am new to multiroters and read in forums that the naza lite is one of the easier flight controllers to use and set up. With default settings everything worked great except for yaw. when I apply rudder in either direction it will pitch and roll. I have tried adjusting the basic yaw gains 10 point at a time with no luck. I have seen videos of people flying the deadcat and tbs discoveries with the naza so i know it can be done. some one please help

Sound like you don't have the controller in the cog. On a tbs it isn't in the center of the craft.