My suggestion is that since you have presumably done nothing 'important' on your Pi that you can't afford to lose, forget about trying to reset the password and simply re-install the operating system on the SD card.
Sooner or later you will need to do this anyway, so it's a useful thing to learn now.
The 'NOOBS' method of installing an Operating System, which is what you will install if you follow the links from http://www.raspberrypi.org/downloads
has the added benefit of being able to recover a clean copy of the system without having the re-write the card again, just by holding down Shift when prompted during the boot sequence.
How To Ask Questions The Smart Way: http://www.catb.org/~esr/faqs/smart-questions.html
How to Report Bugs Effectively: http://www.chiark.greenend.org.uk/~sgtatham/bugs.html