Change password

leaf>Applications>System tools>UXterm

but I prefer Konsole, which you can download & install with leaf>Favorite applications>Synapatic

then leaf>Applications>System Tools>Konsole

on Konsole command lines:

[for your own account]

m@gPC:~$ sudo passwd

[you may be prompted for [sudo] password, which is your old password]

Enter new UNIX password:

Retype new UNIX password:

passwd: password updated successfully

m@gPC:~$ [end dialog]

[for another user, 'onemore' for example]

m@gPC:~$ sudo passwd onemore

[you may be prompted for [sudo] password, which is your password]

Enter new UNIX password:

Retype new UNIX password:

passwd: password updated successfully

m@gPC:~$ [end dialog]

For a better, long-term way, see users.