I have an account on http://freezope2.nipltd.net/"myAccount" and I would like to enter new co-workers. But it is not possible. How can I do this? I tried as is written in the Zope-Book. But without success.

freezope accounts are probably somewhat limited compared to a real Zope installation. I wouldn't be surprised if you couldn't add a users folder. But maybe that's not the problem: where exactly is the issue?

And my second question is: How can export my Zope-Account to an other machine? I want to edit my files local and then upload to the net.

Have you tried the Import/Export button at the bottom of the ZMI's folder management page? Work great. --jcc