Curvefever 3 - Questions

Hey everyone, I played Curvefever 2 very much but stopped more than one year ago. Now I wanted to start with Curve 3 but before I start I have a few questions:

I play with this link: http://curvefever.io/play ? Where can you register yourself? Or is it possible to play with your old username and pw from Curve 2? I tried but I couldn't login and there is nowhere a field with "register".. :s