Can't find the Texture Paths on my .nif file

[Dimitrisgb]

I try to fix a bug on a new set of armour that I made, but when I open the nifscope there is no option of setting the texture paths anymore. I haven't changed anything in the mod, or the .nif file.
I can't post a picrure of how it looks (I get a message that says that I am not allowed to use that image extension).