Password problems with postgreSQL

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http://serverfault.com – I've accitently managed to install postgresql 8.4 on my mac. I have no Idea on how to use this stuff and want to get it uninstalled. I tried a tutorial on the web about manuall uninstallation, but after typing in the first command in terminal: "sudo /sbin/SystemStarter stop postgresql-8.4", terminal says: "to proceed, enter your password". Then after I've entered my old admin password (that I've allways used to log on my computer or in cases of installations) terminal just says: "sorry, try again". This is my main problem! My old admin password doesn't work for som reason after postgrsql got i (HowTos)