Unfortunately, those methods no longer work in 10.7 Lion or 10.8 Mountain Lion. MacYourself previously published a popular article explaining how to reset the password on Macs running 10.4, 10.5 and 10.6. One of the most common questions Mac users ask is, “How do I reset my Mac’s password?” If you’re using Mac OS X 10.7 Lion or 10.8 Mountain Lion, there are a couple ways you can go about it – and they’re both pretty easy to do.