My Administrator password is not working on iMac mini Mountain Lion. What can I do?

When I set up my iMac Mini (Mountain Lion) I wrote down my Administrator's password. Now, when I put the Administrator's password in it does not recognize it. I've tried every password I can think of and none work. What can I do? I've read some ways to reset it but none look very safe. I don't want to mess things up, I'm not real techy.

https://discussions.apple.com/thread/5478030?tstart=0

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11:31 PM Saturday; August 11, 2012
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
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My Administrator password is not working on iMac mini Mountain Lion. What can I do?

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