HELP! Can't connect my Nook HD+ to wireless!!!

I'm needing help getting my Nook HD+ to connect to my wireless. I had this problem before with my Nook Color & spent 2 hours & 45 mins on the phone with a tech support that was no help. I got it to work on my NC by pushing the reset button on the router in for 50 seconds & then turning the router off for 5 mins & when I put the password in it worked. I tried that this time but it didn't work. HELP!!!!