Okay, I'm using the BETA1 version of unLZ.GBA, and I did everything that you said in the tutorial. But the things in my unLZ.GBA look different, such as the offsets for the palette and picture when I try to write into the ROM have a 00 in front, and I have 4 checkmark-able options instead of 3(but I only selected the ones in the tutorial).
When I wrote the sprite in, it didn't do anything except change the picture's palette! It ended up looking like this:
And this is what I wanted to put in: