Help with applying my texture

hi, this is my first model and i am have trouble applying my texture so that it will appear in the render window and in the game.
the helmet is a netimerse file for either morrowind or oblivion, I have the export scripts and everything and I can get it in game just its grey.
The way i attempted to apply the texture was through the uv/image editor window and the texture appears in the 3d view window, what do i do to apply the texture to make it appear in game?
by the way, the texture is a dds format and is in the textures folder in the data file in my morrowind directory,and the mesh is in the corresponding folder.