Can Someone Help Me out

I Just put in a K&N air filter and my engine light came on. I know it's related to the sensor that was in the old air filter box. How do I modify this problem?

P.S I'm new to cars so if you can please be specific. I really appreciate any help given...

you were supposed to disconnect the battery why changing the intake, so now you have to reset the ECU(on driver's side next to the accelator pedal in the center, below radio) There is tape covering a screw, forgot which way to turn it.

Now, I looked underneath my dash and nothing seems to look obvious. It's a 96 Nissan Max SE. Can u help me out plz, is it labled? Is it screwed somewhere by itself? I appreciate your response back. That light is truly annoying at night!

when u placed the k & n your mass air flow sensor probobly set off the sensor. make sure that the connection on the clips are secure. I put a K & N filter in my car and had the same problem

this is how reset the computer-> http://www.seas.ucla.edu/~cheston/images/reset.gif

to find this computer, u need to unscrew the cover which is next to the acce pedal, after u remove the cover, u will see the ECU.:)