Once you are logged in to your account click on the "Users" tab on the side bar.

Then locate the "Updates" column and click on the red key symbol located in the same row with the user you are trying to change the password for.
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A warning window will pop up asking if you are sure about reseting the password. Click "Yes".

An email will be sent to the user with the link to reset password.
Enter the new password, confirm password and click "Set Password".

A window will pop up indicating that the password has been changed successfully. 

Click "OK" and you will be logged in to the home page.