I need to find my. I need to find my computer pass word so i can down load an update for my

Question

I need to find my computer pass word so i can down load an update for my macintosh. Installedtiger Mac OSX v10.4 and need to update to 11. The man who installed it can'y remember either. I know i wrote it dowm. I have Lari66. but i had him take that out as i got tired of typing it in as no one uses my computer. I would like the answer to be e-mailed. [e-mail]