Hello and welcome to our forum.
Please write in englisch in here, since Google translation is a little clunky and chances are high, that many user cant even read you question
Regarding your question:
I suppose you want to register and use the Client of teamspeak beta?
You can learn about the new Client here
You can register here. Also keep in mind, you that you will most likely have to wait until you can actually before you can download the client, since user access will be unlocked in waves.