I'm tempted to tell you; if you can't find it, then you have no business trying to do an osd mod
because it means that your not looking for the information
anyways the thread is the first one, sticked to the top of the osd section of the forum
and also the wiki page has a link to it as well
this is a case of read the wiki closely, don't just skim through it
also the wiki has the basic updating steps at the bottom as well
you're really getting into stuff that we can't hold your hand each step of the way