Editing an entities texture

[JetlinerX]

Okay, thanks. The second part, I am no artist, how can I create that new texture. Really here is the situation:

I made the muddy footprints an entity, but they are brown, and I want them to be red, and you can't change the color within the editor, so I am just wondering how to change the texture from brown to red. How do I create a .dae? Or, if someone has a few mins free, would they be willing to do it for me with a credit slot at the end of the story?

Thanks in advance.