I just converted to WordPress and want to keep the same format of my old site, which includes an 'article id' in the url. The article id is just a random number and unique number that's created once the article is posted. Of course, I already know what code to use. I need to know where to put the code. Please be specific. Also, since I will use this in the post's url, how would I go about doing that in the Permalinks section?