howto change path special folders to external hdd

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http://askubuntu.com – I'm trying to change the path from the special folders (I mean the ones in my home directory) to folders on my external HDD. I already auto-mounted the HDD by adding a UUID-command to the start-up applications /usr/bin/udisks --mount /dev/disk/by-uuid/7a92f7dd-bd54-4a1c-88eb-be7eea04e79a That's the one. Now I tried to edit ~/.config/user-dirs.dirs, but every time I reboot it goes back to the home folder Am I missing something somewhere? Help much appreciated. (HowTos)