Haha, no problem! Buut, I actually didn't use a specific tutorial for this or anything. If I remember correctly, I just popped a completely opaque image on there and set it as a stencil in CTU. It was as simple as that, since stencils don't ~need~ to be recolourable.
I'm sorry if this is a really crappy explanation, I don't really have easy access to any of my TS3 project files to confirm this for you right now. :(