The tutorial was from TheTommynator and used the shader from Loopix I think, but the link seems to be dead. Anyway I don't thuink that you should try to import the terrain over map format using WED, tis never worked for me...

Earthsculptor generates Heightmaps of the terrain when saving as .png images. For getting the terrain into med you have to convert the.png image with a graficsprogram into bmp pcx or tga and then import this image into med using import terrain from image option. Then you have to rescale the terrain as it probably will be shown to flat in med, but that shouldn't be a problem.