You're confused about something, too.
NAT stands for "Network Address Translation" and does not have settings like "moderate" or "open." It's the functionality that lets the router route packets from the outside to internal local IPs. NAT is responsible for you being allowed to use more than one computer on your network.
As for what your asking, I'm going to guess you're wondering about something concerning your security. Are we talking about moving from WEP or WPA to "naked as a newborn babe?" Also, we will need to know what your wireless router is, or you aren't going to get very specific or helpful answers.
-- To further confuse you --
If you're wondering about NAT, you might be trying to direct outside traffic at one of your local systems? Generally your router acts as a DNAT ("Dynamic NAT"), which will block incoming traffic unless you tell it where to go. You can set up an SNAT ("Static NAT"), which directs all the incoming traffic at a specific internal IP. It's probably most easily implemented on the router as a DMZ, which is an exposed internal IP, segregated from the rest of the internal network for security purposes, which incoming traffic is directed to.
So, in order to be useful, we'll need two things: What, specifically, are you trying to do and what is your wireless router?
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