Thanks to the tip from edlin303, I just figure out how to get a direct referral link. For future reference, new signups don't generate the unique referral link until you create your own user names.

Steps to set up user names and get the unique referral links:

1. visit the Smack Shopping/Watch the Show section, then the site will prompt you to pick a user name.
2. create your own user names.
3. go to the my info tab at the top.
4. click on my referrals on the left of the screen, your unique referral link will be under refer a friend details link.

OK. Class dismissed.

Next, please use my referral link. Thanks!

http://www.jellyfish.com/users/signup/lin821