Check your path.
From your screen shot you would need the texture in the same folder that the model's X file is in.
I usually assign a texture in the FPE file and not in the editor, but that's just me.
I also suggest using a better naming method, but that is just me.
I mean, 2.dds is not very descriptive and it is a good practice to start a name with a consonant.
I don't like to use a number or special character as the first character in a file name.
I use underscores instead of spaces and use at least 3 characters in length.
Like I said before though, that's just how I like to do it.
Just double check the path.