Change the enable password on a Cisco router

The enable password is similar to the superuser or Administrator password and protects your router. Only after authenticating with this password can you make changes to your device.

To change or set the enable password to PaSsWoRd:

config t
enable secret PaSsWoRd

The enable pasword PaSsWoRd command will also set the enable password, but will leave the password in plain text and visible in the router configuration. This is not affected by the service password-encryption setting.

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courtesy http://www.tech-recipes.com/rx/80/change-the-enable-password-on-a-cisco-router/