Cannot get my airport express to allow multiple internet users.

Good morning.  I recently had TW install internet and phone (cable, but no TV) at my home.  My modem is a Scientific Altanta DPC 2203 and I have my AirPort Express hard-wired to the modem.  I was able to access internet using my MacBook, but cannot get a wireless connection on my iPhone, my beau's iPhone or his laptop. Time Warner (RoadRunner) keeps insisting the problem has to be in the wireless router. I have read the manual for AirPort Express and run through every tab of the set-up menu and cannot figure out what is wrong. 
I would be grateful for any help you might offer.  I'm convinced this is a simple problem and I'm overlooking something obvious, but maybe not.  The tech support people at TW are very argumentative and insistent that this modem does not distinguish or create single users.  In my experience, it is usually an issue with the router, not the modem.
Many thanks,
Elaine

On your Mac.....
Open Macintosh HD > Applications > Utiltiies > AirPort Utility
Click Manual Setup
Click the Internet icon
Click the Internet Connection tab just below the icon
Settings should look like this.....
Connect Using = Ethernet
Connection Sharing = Share a public IP address
Click Update to save any changes and allow 40-45 seconds for the Express to restart
Power down everything on the network....modem, Express computer(s), printers, etc.....order is not important
Wait at least 15 minutes...longer will not hurt
Start the modem first and let it run for 2-3 minutes by itself
Start the Express the same way
Start each device one at a time about a minute apart until everything is powered back up
Check for proper operation.
Call the cable company to tell them they were right   

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