using patch

Hi, I'm new in linux and its scripts. I apologize for my foolish question. In this mailing list I found this patch http://bugs.gentoo.org/attachment.cgi?id=102981 for gigaword. But how to use it? Where should be added this patch? and another one http://www.netexpertise.eu/en/freeradius/daily-accounting.html. Where exactly should I set this scripts ?