Trying to setup Time Capsule, how do i fix status that says "double NAT", preventing wifi from working?

In setting up Time Capsule, it won't connect to wifi.  In the status pop up of the Time Capsule under the Airport Utility it says "Double NAT".  I dont' know how to fix that.
Thanks.

This is one goofy modem that acts as if it is a router, so that is why the Double NAT issue is appearing.
There are two ways to tackle this:
1)  If everything seems to be working OK, you have the option to click to "Ignore" the Double NAT error in AirPort Utility and the Status light will turn green.
Double NAT is usually not too serious of an error on a simple home network, but it will be a deal killer if you have an online gaming console and want to play games interactively on the Internet.
Your connection will slow slightly because of the multiple NAT firewall layers the signal must pass through, but you will likely not notice this in normal browsing, email, etc.
2)  Reconfigure the modem to act in "bridge mode" only and then change the method that the Time Capsule uses to connecf from Ethernet to PPPoE service.  There will be no NAT errors this way and this is what AT&T recommends....see link below.....but we are talking about some major surgery here.
http://www.att.com/esupport/article.jsp?sid=KB401764&cv=801,902&title=Connecting +a+non-AT%26T+provided+router+to+your+AT%26T+Internet+connection#fbid=kfca5LRlzv D

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