If you're running apache 2.x with custombuild, then it's already in the file:
/etc/httpd/conf/extra/httpd-info.conf
Change the "Allow from" lines to include your IP (eg: 1.2.3.4), OR remove the line completely to allow from all.
<Location /server-status>
SetHandler server-status
Order deny,allow
Deny from all
Allow from 1.2.3.4
</Location>
<Location /secret-server-status>
SetHandler server-status
</Location>
Also change uncomment the #ExtendedStatus by removing the # character:
ExtendedStatus On
For apache 1.3, edit your /etc/httpd/conf/httpd.conf and add
ExtendedStatus On
<Location /httpd-status>
SetHandler server-status
</Location>