Final answer:
In XFi, under Add a Device there are two options: Manually Add a Device requires manually inputting the device's details, while XFi's Scan for Devices automatically looks for and adds new devices.
Step-by-step explanation:
The XFi interface, being a part of Xfinity's Internet service, allows you to manage and add new devices to your network. If you wish to Add a Device, XFi provides two major options. The first option is to Manually Add a Device. This requires you to manually input the device's details. The second option is to have XFis Scan for Devices. This simpler method enables the system to automatically look for and add new devices currently trying to connect to the network.
Learn more about Add a Device in XFi