setting up airport time capsule with extended network
I just purchased a new AirPort Time Capsule (set-up worked fine) and I would like to extend my wireless network by adding an AirPort Extreme via Ethernet. The Airport Utility menu shown in Apple's article on this topic (Wi-Fi base stations: Setting upa nd configuring a roaming network (801.22 a/b/n/n) is different my Airport Utility menu. I am on OS X El Capitan.
Can someone point me to a current article or help? Thanks.
AirPort Time Capsule-OTHER, OS X El Capitan (10.11)