Changing layer opacity

- [Instructor] So this is where we currently are…in this chapter and I am working on this cat cartoon,…you could of course be working along…with any file of your own, and what I've decided…I'd like to do here, is I'd like to add a shadow…underneath the cat.…So I've just made my background layer active,…because remember any new layers that you add…are added above the current layer, I'm going to tap…the plus at the top there and choose a draw layer,…and I guess, giving that we've just been talking…about the importance of layer naming,…I ought to actually do that here,…because otherwise that's a little bit of a poor show,…isn't it?…So there you go, I've called that one Shadow just there…and now I'm going to get a pen, so I'm going to use this round…nib at the top here, let's make that a bit larger…and let's choose maybe a slightly lighter gray…than the one I've currently got,…and let's come out and make a little bit…of a shape just here, oopsie daisies,…so I'm going to swipe to undo that,…I'll carry on with that bit there,…