HT201240 I have forgotten my admin password. Any idea what I should do. I do not have an install disc at one didn't come with the iMac. Have version os lion

I have forgotten my admin password. Any suggestions what I can do. I do not have a start up disc as the iMac (bought at christmas did not come with one. I have lion os.

Boot to the Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
When the menubar appears select Terminal from the Utilities menu. Enter resetpassword at the prompt and press RETURN. Follow instructions in the dialog window that will appear.

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