I hope I'm not in the wrong posting place.
I am able to use mywi when the USB cord is connected, however not with wifi I was wondering if anyone else has this problem or knows how to fix it may or may not help, but when I look at status it says on and says "AirPort has the self-assigned IP address xxx.xxx.xxx.xx (if needed I can give the numbers) and will not be able to connect to the internet.

Any help would be greatly appreciated please and thank you.