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You may likely have the older A1084 or A1088 version of the Express. Check the model number in the faint print on the side of the device.

If you do have the A1084 or A1088 version, AirPort Utility 6.x packed in with Lion and Mountain no longer supports these older versions of the AirPort Express.

If you have another Mac there running the Leopard or Snow Leopard operating system or even a PC, you can use that computer to configure and administer the older AirPort Express models.

If you don't have any of the above options, it might be possible to use a workaround.....not supported by Apple, so there are no guarantess here....to install an older version of AirPort Utility on the Mountain Lion Mac. Post back if you want more details on that.

However, the remote airport is not relaying my wifi signal

The A1084 AirPorts do not have a setting to "Extend a wireless network", which is what you need if you want the Express devices to provide more wireless signal coverage.

As it stands, the AirPorts are likely configured to "Join a wireless network". This will allow you to use AirPlay / iTunes...or connect a printer to the USB port on the Express, but the AirPort Express devices cannot provide any additional wireless signal coverage when they are configured to "join" a network.

Can you check to see how the AirPort Express devices are configured?

They are a1084s and are configured "join wireless network''and "enable airplay".

So, if both A1084 Express devices are configured to "join a wireless network, etc.......then you must have another wireless router there that is creating the wireless network signal.

Is this another Apple router, like an AirPort Extreme?

If yes, please check on the bottom of the device to locate the Axxxx model number and post back that info.

If not, what wireless router do you have there? We would need the make and model number, please.

I purchased 2 a1392s about a week ago and havn't opened them because no one at 2 apple stores, 1 Macoutfitter store and a call to Apple could tell me what you did in your responses.

Sorry, you have lost me here. What are you referring to here?

So, if I got this right the a1392s will give me airplay and extend my wifi through both a1392 airports.

Unfortunately, we don't have enough information to know whether the A1392 devices might do what you want, or would be compatible with your "main" router.

I think you are going to have to assume that we don't know anything about your proposed network......(we don't).....and detail the modem, main router, and how the A1392 devices and A1084 devices would all work together.

Once we have a clear understanding of all of your devices and how you plan to have them all work together, we can likely offer more advice.

Thanks for the clarification.

If you connect the first A1392 to your router by Ethernet cable and configure it to "Create a wireless network"......and......locate the second A1392 where it can receive a strong wireless signal from the first 1392.....then the second A1392 can be configured to "Extend a wireless network" to provide more wireless signal coverage in the general area where it is located.

Try to minimize obstructions in the direct signal path between the two Express devices for best results. Ideally, they will have line-of-sight with each other.

The Ethernet ports on the 2nd A1392 will also be enabled, so you can connect an Ethernet device that way if needed.

AirPlay will function as normal, as will the USB ports on the Express devices.