Please note that you can only do this if you obtain a legitament KSSN, I will not help you through PM or through the Korean/Foreign Forum. Talk about them is prohibited.
Well, here goes first go to http://netmarble.net/
In the upper right you will see
You'll be prompted by
Then you will be prompted by the dreaded KSSN screen, with some looking you can find one
Got past that? Good stuff - now on to the registration
The email pop up is pretty simple
Well now you have the address bit, use this for your address "거진읍"
To get that refer to the picture below.
Should look something like that afterwards
Click the left & be prompted by
Simple enough, Click and poof
Quick guide with some mistakes but it should be all you need.