i guess you've uploaded them and they aren't showing?
there are a number of reasons they might not be showing.
Taken straight from the FAQ:
"
Make sure that the texture matches these requirements:
1. All textures are of size 128 on 128 pixels.
2. If you upload a TGA file ,make sure it's saved in uncompressed format.
3. The texture is unique. You can't upload a texture that someone else uses.
4. The texture cannot be Black and White only. There must be at least one colored pixel"