Q: airport tome capsule

The AirPort Time Capsule must connect to your modem, or modem/router using a permanent wired Ethernet cable connection....just as the Setup Guide for the AirPort Time Capsule illustrates.  Connect the Ethernet cable from the modem or modem/router to the WAN "O" port on the Time Capsule.

Then, continue to follow the instructions in the Setup Guide to set up and configure the AirPort Time Capsule. If you have a Mac, click the WiFi menu at the top of the Mac's screen and look for Time Capsule under the listing of New AirPort Base Station.  The example below shows an AirPort Extreme, but you will see Time Capsule on your screen.

If you are using an iPhone or iPad to set up the Time Capsules, tap to go to the Home Screen. Then, tap Settings (the gear icon) and tap WiFi.  Tap on Time Capsule under the heading of Set Up New Base Station.  The example below shows an AirPort Express, but you will see Time Capsule on your screen.

When you click or tap on Time Capsule, that will get the setup "wizard" up and running. Follow the prompts to set up the Time Capsule.

Once the Time Capsule has been set up, you can connect your Mac using the wireless network that you have set up to back up, or if you prefer, you can connect the Mac to the Time Capsule using an Ethernet cable.  Connect the Ethernet cable from the Mac to one of the three LAN <--> ports on the back of the Time Capsule.