It's been a long time since I tried it, but the Forgot Password link in the navigation bar worked well for me the time I had to use it. I believe the trick to making it work is knowing the e-mail address associated with the account.
If the member knows neither her e-mail or password, then the ticket route is necessary.
If you go to www.yuku.com
the Navigation bar is up in the top right hand corner.
Hope one of these suggestions helps. Keep me posted. You can Email me at: SuzannaOR @ Yahoo. com (without the spaces, of course