How do I install software on my iMac without the master password?

My parents have an iMac (Mac OS X 10.5.5) and I don't know the password for any two of the accounts so i wouldn't be able to make a new account. And i can't reset the password because they would get sooo pissed at me. So I was wondering how to install software without theany of the master passwords.How do I install software on my iMac without the master password?You can't. If it's something they would not object to you having, just ask them. If they don't want you having it then you shouldn't.

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