The Material Editor settings for this texture will appear,
including tiling and offset controls under “coordinates”
and a link to change the file under “Bitmap Properties.”
NOTE: the actual texture is not loaded into 3ds max: just a pointer to the texture file. When moving the max file always bring the texture file, and to maintain the link between them do not move the files individually: place them in a folder for the project, place the textures in a subfolder, and only ever move the entire project folder.
To return to the top level of the material (for shaders and map channels) hit the “Go to Parent” button (below and to the right of the other material spheres).