how create user group?

how create user group?

Hi
 
  could you please tell me below questions:
 
   1,how create user group in a wiki ?
 
   2,when invite a new user join a wiki who must sign-up a zoho account?
 
   3,can create file folder in page of file cabinet or can give a tag for the file?
 
   4,why the poto can't sildeshow when I embed a picasa album?
 
Thanks
 
Stanley Guo


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