How to change the location a shortcut is linked to?

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http://askubuntu.com – I have 12.04, the initial user account name is google, then I changed the user name from google to linux. I move /home/google to /home/linuxand update the /etc/passwd file. But now, when I click the shortcut in unity, say, the Downloads, then give me no such /home/google/Downloads directory since already renamed to /home/linux/Downloads I can create the /home/google as symbol link to /home/linux, it's working, but I do want to change the directory/path the Downloads shortcut point to. So, do you know how to change the property of the shortcut? (HowTos)