The Mugen Fighters Guild - Can't add background on 255 palette image

So I've been working on a character that has hundreds of random images in its files, but because it's been well over a year since I've had to add anything new to it and I've completely forgotten my method of doing it. What I used to do was go into photoshop and index the images then add the pink background to act as the transparent color, but whenever I try to add the pink to the image I just indexed, it changes the pink to the first color in the color palette and I don't remember how to edit the palette to make the pink go first. I've been stuck on this for hours now and no tutorial is helping me with my problem so I'm at a loss for what to do

To the left in this image is one of the older pictures I used for the character that I was able to complete the process with. To the right is what happens when I do that exact same process but tried to add the pink, only for the color to change

I have no idea what I'm doing wrong and nothing I find online is helping me so I genuinely need help on this..

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Can't add background on 255 palette image (Read 894 times)

MrSaturn100

Can't add background on 255 palette image

xcheatdeath

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