You can’t. Those are disabled, because they are still to be implemented by us. Paint tools will come in one of the next alpha updates. But this is one of the large features, so it will take a few months before we are ready with that.
Well, yes. But our priorities changed a bit last year, so as I wrote about somewhere in the blog, we wanted to focus on getting AP out – and then first thing after, we will release an update (free) which includes the finished coloring features.