Help - Extending Range of AEBS

At student accommodation with an Airport Extreme Base Station. Were supplying internet to 6 other mac/pc users.
We have just brought Airport Express wanting to extend the range of the Airport Extreme to one other Mac user.
But we are having problems doing this... we dont no how?
The Airport Express is plugged into the wall and flashing Amber connected only to the mains.
The Airport Express is not showing in the Airport Admin Utility altho i sat with my ibook right next to it... and in range of Airport Extreme.
Any Help would be great. Thanks
Ollie

Ollie, It almost sounds like you have a bad airport express. Even if you didn't have any other Airport basestations you should be able to see the airport express in Airport admin utility.

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