How can I fix this landscape problem?

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?

Hey adriamorales103,

Below is link associated with it. I hope helpful.