Hacking Yoshi's Island trouble

[JujuMagumbo]

I'm probably just a noob as this, but with Yoshi's Island, I can't find the background texture in BrawlScape so I can replace it, I replaced the tubes but when I play them they look all green and matrix-y, and the blue poles in the background just got all screwy and weird. Any help?

[JujuMagumbo]

...anyone?

[XynZ]

same problem