You have to change the LILO boot options
The relevant extract from the Security-HOWTO is
## 3.3. Boot Loader Security
##
## The various Linux boot loaders also can have a boot password set.
## Using lilo, take a look at the "restricted" and "password" settings.
## "password" allows you to set a bootup password. "restricted" will let
## the machine boot _unless_ someone specifies options at the lilo:
## prompt (like 'single').
##
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