Post configurator is shipping with NX and is installed if the typical installation is used.
You need a CAM license and a nx_post_config_adv license, which is part of all newer CAM bundles.
What license bundle do you have?
Production: NX10.0.3, VERICUT 8.0, FBM, MRL 3.1.4 | TcUA 10.1 MP7 Patch 0 (10.1.7.0) | TcVis 10.1
Development: VB.NET, Tcl/Tk Testing: NX12.0
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The older method is to use Post Builder.
This is started separately from NX (alster as needed for your NX version):
"Windows" menu -> All programs -> Siemens NX 10.0 -> Manufacturing -> Post builder
Post Configurator is the "go forward" posting technology, but I haven't had a chance to play with it yet, so I don't know how it compares to Post Builder.
Production: NX10.0.3.5 MP5 + patch/TC11.2
I'd rather be e-steemed than e-diseaseled