Thread:Project:Support desk/$IP - Where do i have to put that?

I have the three lines in the config/index.php: $IP = dirname( dirname( __FILE__ ) ); define( 'MW_INSTALL_PATH', $IP );
 * 1) Attempt to set up the include path, to fix problems with relative includes

As my provider told me i have to put the include path manually in this file my quetsion: Where do i have to put this exactly? Can somebody give me an example?