How do you whitelist MAC addresses on the XR500

[Nighthawk Pro Gaming]

I just purchased the XR500, and after performing the basic setup, I'm trying to figure out how to whitelist MAC addresses.  I see I can blacklist a MAC address from the "Device Manager", but that is not even remotely useful.  On page 51 of the documentation, it states that you can setup a WiFi Access Control List from "Settings > Advanced Settings > Advanced Wireless", but I don't see the "Wireless Card Access List" section that is specified.  The "Advanced Wireless" page appears to have more on it, but a huge portion of the page disappears the second after it loads.

 

Is there an option I am missing to enable this?  Or did I just fall victim to a documentation bait-and-switch and spend $300 on a router that can't even perform basic functionality that existed in routers 15 years ago?

 

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