first - If you have apache installed from your redhat installation remove it.  To check if the Apache rpm is installed "# rpm -qa | grep apache".  To remove the rpm "# rpm -e apache".  If that errors and says there are some dependencies, remove them. "# rpm -e name goes here".

In a terminal window change users to the superuser account "root".  "$ su -" press enter and type the root account password.  The rest of this will be done in that terminal or any other that is logged in as root.