First off, I'm not sure if there is an easier way or if this has been posted before
Step 1. open up the browser of your choice and go to Live.ca (or .com w/v) (also know as Hotmail)
Step 2. create an email account [with fake information] on that site (and leave it open)
Step 3. open up Nexon.net on the browser of your choice (in a new tap) and click sign up
Step 4. enter in the email you have just created
Step 5. go back to Hotmail and check the emails
Step 6. click the email from Nexon and copy the site link down(with Ctrl+C)
Step 7. open up Google Chrome Incognito Mode Browser (or anything else that masks your ip and cache and stuff) and paste(Ctrl+V) the site in the address bar
Step 8. enter your [random] information into the Nexon create account site thingamabob(that's a real word?) and finish
Now you are done and have a new account that you can use to hack or other things (you can't do free NX things if you get error 51)
p.s. i may post a video up sometime later if i feel like it