Airport Express not connecting to Broadband router

Dear Apple lovers,
I have been stuck with an issue for the past few weeks, and i hope that your experience can help me sort out the connectivity issues.
Infrastructure:
Telco-provided Broadband modem router provides the internet connectivity. it connects to the house rooms thru data points.
I have an Extreme setup as a extender to the broadband router (becuase the rooms are far way from the broadband router, i have to do extend the wireless..)
The Extreme has been working fine for the past 2 years, even after the broadband modem router has been upgraded.
However, the Express started giving problems as soon as the broadband modem router was replaced.
I have tried resetting the Express many times, i've tried creating a new Network (they ask for PPOE settings which creates endless loops), creating it as an extender to the Broadband and even to the Extreme. So i've tried all options, and i'm not sure where to start looking for answers (searched this forum many times..)
Issue is that the Express is the furthest away from the Broadband, and if the room doors are closed, the Express has to rely on the Ethernet connection to the broadband for connectivity. Which makes me think that the right installation option to choose is " set up as an extender to Broadband modem" Is this correct?
With the doors closed, the express cant reach the extreme too (extreme is in another room). 
I have an iMac, iPhone and iPod that has been suffering from no WiFi for the past month.. we're like in rehab for Internet addiction.. Hope there's a kind soul out there who can point out the right direction to follow (chose which option), or to diagnose the problem, and eventually solve it.
There's also intermittent issues with setting up the express, it just cant be configured. But it still blinks orange and green(sometimes). So i dont think the express needs to be changed..
Thanks in advance for the help  ( if any.. ) 
Have a nice day!

I didn't understand how you had the setup and configuration.
You have a modem router combination device that is creating a wireless network, an AirPort Extreme that is extending the wireless network, and an AirPort Express that is also extending the network?

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    Message was edited by: -MTL-

    Follow the isntruction lisetd below...they work.
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    ===============================================================================
    OMG!!! You are da man!!!
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    ===============================================================================

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    Network Name: <existing Motorola's wireless network>
    Wireless Security: <select the encryption type of the existing wireless network>
    Wireless Password: <enter the existing wireless network password>
    Verify Password: <re-enter the existing wireless network password>
    AirPort Utility > Select the AXn > Manual Setup >Music
    Enable AirPlay (checked)
    iTunes Speaker Name: <enter desired speaker name>
    iTunes Speaker Password: (optional)
    Verify Password: (optional)
    Click Update to write the new settings to the AX

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