I know you say you're already pointing at it, but just double-check you have the correct folder (the one your Native Access' Kontakt 6 installation path is pointing towards) in your VST Plug-Ins' locations. Here's mine for reference:
Next, go to your Instruments tab, right-click, click Refresh:
Wait for the refresh, and then check Kontakt's not magically hidden (white dot means it's visible):
I only have Kontakt 5 (full) and Kontakt 6 Player myself, but my Kontakt 6 Player is simply named Kontakt.