Hmmm... Well, you know the coding in the .material and stuff, right? You basically just need to double that (By copying and pasting below it, of course), add the second texture name next to the "texture" thing where your first texture was, change the material name etc. I think you might get confused by what I'm saying, so err, perhaps you can provide the coding and I can show you what I mean? Unless I can get to my main computer, but that'll be some hours from now on.
If you already have the texture material thing and stuff, though, I'm pretty sure there's an arrow next to the name of it on the page. ...Hhhh, again, I'd do /much/ better with screenshots and other examples. Plus I'm tired too. So if you mean like, you have two textures, and you don't know how to put them on a mesh, I can help with that? Or do you mean something else?