I downloaded MySQL-server-4.0.18-0.i386.rpm and did a

rpg --checksig MySQL-server-4.0.18-0.i386.rpm and get a warning: MISSING KEYS GPG45072eH5.
Is this OK?
I installed it on redhat 9.0 anyway. But I can not find mysqladmin in /usr/bin to change password for root.

top shows a mysql instance is running.
Thanks.