Hooking up to Smart TV

I am trying to hook up my wife's smart TV so she can stream. Using the AF3 gateway. It is recognized by the Smart TV, but is asking for an SAE password. I have put in the password on the Gateway, but that does not seem to be it.  Was wondering if the Gateway might be a bit far from her TV, as the signal we get here in the Country side can be only one to two bars at best. The TV in the Living room where the Gateway is located, works fine.