It says......., Before you begin using your Amazon Echo Dot and the Alexa Voice Service, connect it to a Wi-Fi network, and then register it to your Amazon account from the Alexa app.
So is the wi-fi network the number on your modem, and by the way I am on laptop,
Are you using the alexa setup facility on your computer? I have just looked at mine and it says words to the effect of plug in your Dot and wait till you see an orange light...then you move to the next screen and it says go to settings on your computer and find the wifi setting Amazon xxx then press continue. have you done this?