I suppose the file is installed
in fact to run the apache , you do it via httpd
you can run it at boot :
run the setup program, in the services you check the httpd
to run it , from xterm,
/etc/init.d/httpd start
to check if it is running
ps aux | grep apache
you get several lines with apache
to check now :
run in netscape (or any browser :
http://localhost