Choose your server from the list that appears

I administer four Yosemites servers using OS X Server.

Everytime I launch OS X Server I have to option to Continue, which I do not choose. But I never get a list of other Macs to Adminsiter. I always have to choose "Other Mac" and enter the URL, etc. This happens on two Macs running Yosemite and being used for administrating.

Where is the list of other Macs? No matter how often I connect to them, they never show up and I can find nothing in the menus to add them.

According to How to administer OS X Server remotely using Server App - Apple Support it should be there:

• The first time you open the Server app on your admin computer, do not click the Continue button in the "Welcome to Server" window. Instead, choose Connect to Server from the Manage menu.
• Choose your server from the list that appears, or click "Other Mac" and then click Continue.