It would be nice if Altium simply had a "Place mounting hole" command, but it doesn't. To create a NPTH in a footprint or a layout, use the Place Pad command (PP).
Pad Template: Leave alone unless you already have another pad in the footprint with the same properties, then just select the right template and you're done.
Hole Information (If greyed out, make sure Layer is set to "Multi-Layer"):
Plated: uncheck
Tolerance: Set if you want a tolerance to appear in your drill table
The rest should be self explanatory
Properties:
Designator: Leave blank
Layer: Multi-Layer (otherwise you won't be able to uncheck "plated")
Net, Electrical Type, Pin/Pkg Juper ID, Testpoint Settings: Leave as default, these are irrelevant as the pad won't have an electrical connection.
Locked: You probably want to leave this checked.
Size and Shape:
Should match the hole dimensions so the pad is "drilled out".
Solder Mask / Paste Mask Expansion:
I choose "specify expansion values: and set these to a negative number to make sure nothing is placed on these layers.
Relevant links:
http://techdocs.altium.com/display/ADRR/PCB_Dlg-Pad((Pad))_AD
http://techdocs.altium.com/display/ADOH/((Add+Hole+Tolerance))_AD
http://www.eevblog.com/forum/altium/methods-for-making-a-pcb-mounting-hole-in-altium-designer/msg776878/#msg776878
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