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On your server, you should find a file “wp-config.php” in the root directory of the WPMU installation. You also need to be running WPMU 2.7 for all of these options to be available.

Open wp-config.php and you will see:

define('AUTH_KEY', 'something');

define('SECURE_AUTH_KEY', 'something');

define('LOGGED_IN_KEY', 'something');

define('NONCE_KEY', 'something');

define('AUTH_SALT', 'something');

define('LOGGED_IN_SALT', 'something');

define('SECURE_AUTH_SALT', 'something');

define('SECRET_KEY', 'something');

The “something” above are the values you want to use.