Painting the landscape that already using Auto master material

Hello everyone.
I am new to Unreal. I am studing on creating landscape and need to know how can i paint the landscape. I ve already make a landscape using a master material. So it is automatically set by two texture material; grass and rock. But i need a dirty path or the down surface a lake . I mean i want to paint with more textures or materials. I hope i can explain. THank you for the help

Ohh how can i missed that! Thank you for the answer but if you have a idea about this article please share.

Try reading the docs that came with the auto material. It will tell you how to add layers no doubt.

It all depends on which auto-material it is…

A auto material that use 2 materialfunction (grass and rock). But also i want to paint a custom dirty road. How can i make it on a auto material? Do you have any idea?