I have the same thing happening to me now. Can anyone help me with this. I would like to get this unlocked again so that I may be able to use them.
In the left toolbar, you should have the brush tool.
You need to select that before you can change the settings.
Also, make sure your layer isn't locked, i.e. you're trying to use a brush on the default Background layer.
You should be able to double click the layer and unlock it, if that's the case.