Ok, this is what you can do in the Wiki. On the first link provided, there's a box that says "create page." You can use this to make a page for your particular army/faction or whatever it is you want to make. Make sure that A: your page is grammatically correct and B: well-organized. I'm going to leave it pretty open-ended as far as how much detail you put in it, but keep in mind that this wiki could be a huge aid for the site and we want it to look good.