Hey SSSHAD, you don't have to register anything to be on ngWorldStats. Here is what you do.
Options->Players Setup: There you chose your name. On the bottom, there is an item called "ngWorldStats password" Click "change". Then a new window opens up and you enter whatever password you wish. You are done!!!
To see yourself in the stats, you must:
1) give yourself a password. If leave the password window blank, then you opt to NOT participate in the ngWorldstats.
2) the server you play on MUST have ngstat enabled. Most servers do, but some have it disabled.
This is how it works. The combination of your "name+password" will generate an unique user id# called ngUID. The first time you check for yourself, just search for any part of your name (like PuF, or SSS, etc). From there, write down what your ngUID is so that next time, you don't have to search for it again.
[PuF]BadAss