delete the background layer, and then use any tool (e.g., Eraser, Marquee, Lasso) to erase the portions of the image that ...

There is another method that you can use to make your picture transparent. Click the picture. Yes, the PNG format supports transparency. In Microsoft, you can make a photo in PNG format transparent.

If you want to import some transparent images to your GIF animation, you can do so using the File > Open as Layers option. In case you have images with a solid background but you want to add them ...