Connect an Ethernet cable.....any length that you want.......from one of the LAN <-> ports on the Uverse router to the WAN "O" port on the Time Capsule. This must remain a permanent connection.
Apple assumes that you want the Time Capsule to provide a wireless network, so it will do that during the setup. If you don't need or want another wireless network, it can be turned off after the Time Capsule is initially configured.
On your Mac.....open Macintosh HD > Applications > Utilities > AirPort Utility
Click on Other WiFi Devices
Click on Time Capsule xxxxxx
The setup utility will open up automatically and analyze things, and then announce that the Time Capsule will be configured to provide a network.
Edit to enter the device name that you want to use for the Time Capsule
Edit to assign a name to the wireless network.....something like "Wireless" would be fine
Enter a password that you want to use for the Time Capsule.....minimum 8 characters
Verify the password
Click Next
The utility will setup everything for you in a few minutes. When you see a green light on the Time Capsule...that is a very good sign. Click Done and close the utility application.
If you want to connect the iMac to the Time Capsule using an Ethernet cable, you can do so. Connect from the iMac to one of the LAN <-> ports on the Time Capsule.
You can also use wireless.....either the Uverse wireless.....or the Time Capsule wireless network that you created. For convenience, you might want to use the Uverse wireless network......even though the Time Capsule will provide a much faster signal.
Post back on your progress and let us know if you want to keep the Time Capsule wireless network, or if you want to turn it off and only use the Uverse wireless
