Q: Apple ID for Screen/File Sharing Home Network

I have several Macs connected mostly by ethernet as part of my home network. I am trying to simplify the act of logging into one device from another. One method is to setup a username and password for each Mac, and then use these credentials to log into the other computers when prompted. However, I'd like to use the alternative method of using a shared Apple ID registered on each machine, as described here: OS X Yosemite: Set up users on your Mac at step 8, first bullet point. However, it is unclear exactly WHERE this Apple ID is linked to the user. On older versions of OSX, there is a "Set" button in the Users preferences panel; in Yosemite, this button is no longer present. I have entered my apple ID in the "Advanced Options" screen, accessible by unlocking the lock, and right clicking on the user in question. On the Advanced Options screen, there is a place to enter the Apple ID, as well as an alias. I have also linked all my Macs to my iCloud account in the "iCloud" panel in System Preferences.

I think Apple has made changes to OSX Yosemite, but haven't updated their online user manual in reference to this in Yosemite. The funny thing is am able to log into some of my computers using my Apple ID, but not others, despite the settings appearing to all be the same. I have also tried using an Airport Extreme router (newest version) instead of my Asus router, but it hasn't helped the situation.

Any help or insights would be appreciated...