See Apache documentation for support.
The only usual issue is that root privileges are required to run Apache on the default HTTP port (80).
Apache can be run without root privileges as long as a port over 1024 is set on the httpd.conf file (8000 is a typical choice).
Once apache is started, a test page is accessible under http://localhost if Apache is running on the default port, of http://localhost:8000 if running on port 8000.
The remaining of the steps assume Apache is running on the default port.
Install MEx as a cgi under Apache
ensure that MEx requirements are met
copy mex code folder under apache cgi-bin folder
ensure that the shebang line on the cgi-validate file points to the python installation
ensure the .htaccess file points to existing paths (note that Java for MEx must be 1.4)