Well, you are not going to get very far with posts like that. For some reason I can never duplicate it. I suppose it it is the same as this post. https://www.gimp-forum.net/Thread-White-...0#pid29380
Antialiased edge pixels using the BG colour. (white)
Make sure you have an alpha channel. `Layer -> Transparency -> Add Alpha Channel
Looking at your only other post, https://www.gimp-forum.net/Thread-Cannot...-zoomed-in it seems you hate Gimp. Why use it if you dislike it ? Use paint.net or maybe etch-a-sketch.
Antialiased edge pixels using the BG colour. (white)
Make sure you have an alpha channel. `Layer -> Transparency -> Add Alpha Channel
Looking at your only other post, https://www.gimp-forum.net/Thread-Cannot...-zoomed-in it seems you hate Gimp. Why use it if you dislike it ? Use paint.net or maybe etch-a-sketch.