help try recolor the fishvan

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so uh guys just an mini tutorial how can i recolor the fishtruck traffic car i found this texture from springfiled noir mod just help how do i recolor traffic cars?
my traffic car was the
Export texture > Paint.NET/GIMP/Photoshop/MS Paint/Anything really > Import it back
Its says fishtruck v all but not as fish truck m because you recolor the school bus as an van
Can you upload an vidieo on youtube how to recolor cars in shar