Resetting admin password using another admin password

How do I reset an admin password on the imac from another user who is also an admin?

Hello, Keugantic. 
Thank you for visiting Apple Support Communities. 
Here are the steps that will walk you through changing an admin account password using another admin account. 
Resetting a user's password using an administrator account
Important: Passwords for administrator accounts should not be blank.
Log in with an administrator account. Tip: If you don't know the password of any administrator accounts, see "Resetting the original administrator account password" below.
From the Apple menu choose System Preferences.
From the View menu choose Users & Groups.
Click the lock button if it appears locked; enter the administrator password.
Select the name of the user whose password you want to change.
Click the Reset Password button or the Change Password button.
Enter a new password in both the New Password and Verify fields, and add a Password Hint if desired.
Click the Reset Password button or the Change Password button.
OS X: Changing or resetting an account password
http://support.apple.com/kb/ht1274
Cheers,
Jason H. 

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           OS X Mountain Lion- Reset a login password,
           OS X Mavericks- Solve password problems,
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    I changed my IMac admin password and have now forgotten in and can't find my originàl discs to reset it. I understand you can reset it using apple ID but I can't work it out.  Can someone help me

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    Now, start in Single-user Mode. It should boot into a command line.
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    netinfod -s local
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    reboot
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    hello i forgot my i cloud password..anyone can help me to find my password.i already make a new apple id..but my icloud use another account..so how to reset my iCloud account plz hel me

    Making a new Apple ID is not a good idea, since you have to reset the password for that Apple ID anyway. All of your purchases are tied to the Apple ID that the iCloud account was created under. So, you have to retrieve the password for that Apple ID in order to sign into iCloud anyway.
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    GB

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