Change user password within user with root account

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http://serverfault.com – I'm logged into (ssh) my ubuntu server into a non-root user account. I can not directly ssh into the server as root, because I disabled it. I have the root password. I need to change the user password that I am currently logged into without its password, from within this user. I forgot the command but there was a way to act as foot from within this account, from in there can I change this password? I'm a little lost, so any help could help. (HowTos)