Matching megascan material to multiple meshes

I downloaded the free mushroom megascan pack and am trying to map the texture/material to the 9 different meshes. In this screen, shows the 9 meshes. The image i need to map is in content browser. so i think all the pieces i need are there. is there something I am missing - how to map a part of the image to 1 of the 9 meshes?