Currently Being ModeratedMar 17, 2013 2:45 PM (in response to EJPQ)
If you don't have an ethernet port in the hotspot it is a bit difficult.. well really a poor setup.. but airport utility does offer a wireless option to "Join an existing wireless network"
I cannot find any way to do it from the v6 airport utility.. although I think it is offered as an option in the intial setup of the TC.. sorry.. it is one area where the v5 utility continues as usual to be utterly superior to later version.
Simply hold down the option key when you select wireless mode and hidden option of join will be offered.
The problem is in this mode the TC loses all connection directly.. it becomes merely a client on the wireless.. it will mean all contact to the TC is via the hot spot halving its speed or worse. Plus ethernet is turned off.
It is hidden because it is not a recommended way to connecting.