How can I use the "Paint mode" in a Landscape?

Hi, I’m new over here. I want to make you a question. I’ve spend 2 days searching the way to paint a landscape, in all tutorials seem to be 3 different materials to start with painting a landscape, but when I go to Unreal I got this:

There is no way to paint it, I can’t drag any material or something related to that. I have tried a lot of things, no one worked. Unistalling and reinstalling, verificate the engine… Do you know why?

In your manage you have to select a material first.
The material itself needs to contain Material Layers.