Problem with password and wifi pass thru Air 1.

I am trying to use the wireless pass thru with my Air 1 drive and iPad 2. When I enable pass thru I choose my network from the list. I then get a pop up saying I need a password to connect to this network, but I have no way of entering it. Have tried going into my my iPads Wifi settings and selecting my network which it does with no problem, but I lose the connection with the Air. Help.