I am new at this and am playing around with my Dust.wad textures. I see all the pretty pictures.. draw a box in the editor and then i think i hit replace or something i dont know for sure but I cant get any textures to show in the display area.... please tell me how to fix this problem ... this is my first time using Worldcraft/Hammer and i am dying to make this really exciting map.

Any suggestions would be appreciated.
Thx.