How do I assign a new IP address to second machine on network?

I'm trying to connect a new MacBook Air to my AE network, which already has a MacBook Pro on it. The Air won't connect because the two machines use the same IP address. I know how to change the Air's IP settings, but don't know enough about IP addresses to know what I can change it to so it works. Any thoughts?
Thanks,
Don

2Wire 2701HG-D
Thanks. This is a gateway...a combination modem and router on the same chassis. With the AirPort Extreme on the network, you have 2 routers in series.
That means that the AirPort Extreme must be configured as a "bridge" to work correctly on the network.
Check your settings for the AirPort Extreme using AirPort Utility - Manual Setup
Click the Internet icon
Connect Using = Ethernet
Connection Sharing = Off (Bridge Mode)
Click Update to save any changes and let the AirPort Extreme restart
Power cycle the entire network, power everything down modems, routers, computers, iPhones, etc., order is not important.
Wait 10-15 minutes
Power up the 2Wire first and let it run 4-5 minutes by itself
Power up the AirPort Extreme the same way
Power up all other devices the same way
I'm not familiar with the MacBook Air, but you would want it to connect Automatically using DHCP, not manually.
What happens?

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