The Time Capsule will not "show up" under Devices in a Finder window, if that might be what you are trying to accomplish.
Look for the Time Capsule under the Shared heading on the left panel of any Finder window.
Click on the Time Capsule icon and a folder.....named Data (unless you have changed the name of the drive).....will appear in the window to the right
Double-Click on Data to reveal the contents of the Time Capsule drive
If you now double-click on the sparsebundle file with the name of your Mac on it, another disk named Time Machine Backups will appear on the desktop, and as a Device as well.
In the example below, you can see my Time Capsule, which is named TC
Caution.....this is not a recommended way to access Time Machine backups.....since it is very easy to corrupt the entire backup file. Be extremely careful if you decide to attempt this.