I have forgotten my administrator password on my old Mac Mini
I have forgotten my adminstrator password on my Mac Mini which is using Mac OS X version 10.7.5 I don't have an apple keyboard but a microsoft one instead and it's wireless. How does one reset the computer I don't need to save any files on it as I've already moved them to my new Mac Mini. I have tried doing the alt and the control and the Microsoft key all with both either R or S keys and nothing has worked. After I enter the wrong password three times it tells me I can login using my apple ID but then when I click the arrow to do that nothing happens. Please help me as I need this Mac Mini to be working.
Thanks so much.
Marc
Mac mini (Mid 2011), Mac OS X (10.7.5)