Easy photoshop question (I hope).
I'm following this tutorial: http://www.devwebpro.com/grungy-metal-texture/2/
Page 2 where it says "Then add in some intense grunge brushing in the layer mask."
I am lost there. I have downloaded all of the ABR files for the grunge brushing, and have opened them in photoshop but I can't seem to get the layer mask thing to work. I have made a layer mask for the shape, and I use the brush tool on the shape, but nothing happens. I.E. - nothing of a brush pattern is removed from the shape.
I think I'm missing something, please help.