I want to start hellgate again and i dont know how to create a new multiplayer account. Who can explain it to me?

Don't bother with it. I'm sorry you wasted your time downloading the game.
That being said, if you still want to sign up, do it at the website.
http://hellgate.t3fun.com/home/home.aspx
Create an account there and use it for the game.

In before fanboys.

If you enjoyed the original, you will like it even more now. If you didn't like it before, you probably won't like it now.

Uhhhh how?
If you liked the original then you'll be disappointed to hear that they downgraded the graphics and all the useful items that were previously available to everyone are now premium items.