what are you attempting to accomplish? is it automatically connect to a wifi network?
if you can tell me which desktop variant you are using, i will see what help i can offer.
things to look out for on a desktop installation:
Make sure that the user you created is in the netdev group.
There are also a couple of command lines that i could share that you would only need to run once, that will automatically bring up the wifi interface on the network for you.
so what Desktop are you using? XFCE? LXDE? MATE?