Changing this image to be transparent

[rich2005]

There are a few ways. You could try this way

The image is a jpeg, which does not support transparency.

1. Layer -> Transparency -> Add Alpha Channel
2. Make it all black and white Colors -> Threshold
3. Remove the white Colors -> Color-to-Alpha
4. Optional if you want: Image -> Zealous Crop to trim to size
5. Export as a png to keep the transparency.

...and that as a 40 second animation https://i.imgur.com/i2vQhmg.mp4