nookcolor not connecting to home wifi

Hi... computer idiot here. I just bought a nookcolor e-reader, and while it recognizes my home network, it won't let me connect. It did let me connect to the open wifi at McDonalds, so it isn't that the nook is faulty. (We use an Airport Extreme at home as our wireless router.) The person at B&N's technical department told me I "just need to call Apple and have them register the Mac address of my nookcolor in my Airport Extreme router setup because the Mac filtering system is preventing it from connecting." This is basically Greek to me (although I did find out the Mac address of the nookcolor, which has to count for something). Any help would be much appreciated.