I have had times when a customer would call me with login trouble. They tried to reset the pass yada yada yada.
The only way to easily chnage the password is via the database with phpmyadmin.
Create a generic password such as "password" for your own account and log in to the database and copy the encryption onto your computer.
This way if you need to reset someones password for them you can log into the database and paste the "password" encryption into any customers password box and they can login using "password" or whatever else you want.
You cannot see the passwords, only the encrypted form. But if you know the password before it is encrypted you can reuse the encrypted form as long as you wish.