I have problems of space web.
Is it possible to transfer in other server the folder uploads?    
If this is possible, do I can modify the address in the file settings.pl?    
#######Upload Prefs #######    
$uploaddir = "/ home/newserver/xxx/xxx.it/blahdocs/uploads";    
$uploadurl = "newurl/ blahdocs/uploads";

Or I have to necessarily operate from the Administrator Control Panel moving the whole content of blahdocs ?
How can I insert the codes of access (username-password)?

Thanks

You can't because the directory wouldn't work.  Directories are only local.