To assign a material to surfaces (Method 1)

1. In the scene view, select the object(s) that you want to assign the material to.
2. In the Node Editor, right-click the material to expose its marking menu and select Assign Material to Viewport Selection.

To assign a material to surfaces (Method 2)

1. From the Node Editor, the material node over the surface(s) to which you want to assign the material.