Sharing an internet connection with Airport express and Time Capsule

Hi, I have been happily using a cable modem and a Time Capsule for my internet connection and wireless network. We recently added solar panels to our roof and the system needs to be connected to the internet so it can be monitored remotely. Calling Comcast is an exercise in frustration, and the solar people don't seem to know exactly how to do it, so I'm trying this.
We bought an Airport Express, thinking if it is connected with an ethernet cable to the solar system, it could somehow share the internet connection with the Time Capsule, or they could talk to each other. When I plug in the Airport Express, the only set-up option seems to be to set up a new network, which I don't think I want to do. Can anyone tell me how to set this up? Thank you!

Hi, Under Water.
You should configure the Express to "Join a wireless network" or to "Extend a wireless network". (Either one will work.)
Connect your computer to your Express via Ethernet and open AirPort Utility. Press "Manual Setup" and authenticate if necessary.
Go to the "Base Station" tab. Give the Express a name and password.
Go to the "Wireless" tab. Set the Wireless mode to "Join a wireless network" or "Extend a wireless network." Enter the name of the wireless network created by your Time Capsule (or select it from the list). Check the box that says "Allow Ethernet clients" (if you're joining) or "Allow Wireless Clients" (if you're extending).
Provide the appropriate security mode and password for the Time Capsule's network.
Press "Update" and allow your Express to restart.
Then you can plug the solar system into the Express's Ethernet port.

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