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I would like to set a network connection as metered. I can't find how to do this; it seems to have changed in the upgrade from Windows 8 to 8.1.
I tried following the steps in the official metered connection FAQ. However, when I open the connection, there is no Data Usage heading nor a Set as a metered connection option. I tried this on two different computers, both running Windows 8.1. I also tried doing this for both wireless and ethernet adaptors.
Here's what the connection screen looks like. I've cropped the empty space from the image.

How can I set the connection to metered?
If a set a wifi ad hoc connection by hand, Do you know how set it as a metered connection? Normal instructions doesn't work. – Jose Nobile – 2014-07-03T13:25:20.310
@JoseNobile, I only really know how to do what I covered in the answer! Did you make sure that the connection was active before trying to change the setting? – Sam – 2014-07-04T00:24:58.090
Yes, the connection was active before try to set as metered connection. – Jose Nobile – 2014-07-12T17:38:32.267
@Sam You can actually change it. See my answer below – chmod – 2017-01-10T02:46:33.573