Import an existing user (from another database)
      This username exists because it is being used with another database;
      using it with the current database requires it to be imported.
      
      Note that technically any existing PostgreSQL "role" that is to
      be used as a username needs to be imported this way, regardless of whether
      it is a username in a different database.
    
   
  
    
      Creates a new user
      This username must not be used by any of the other databases. If
      you want to use a username that is already used with another database,
      you can do so by selecting the Import option.