Use an image editor with background removal tools
Open the picture in the editor
Select the white background with a magic wand or color selection tool
Adjust the tolerance or sensitivity if needed
Delete the selected white background
Refine the edges if necessary
Save the image as a PNG to keep transparency
Use an online background remover if you do not have editing software
Upload the image to the background remover
Download the result with a transparent background
Check the image on a transparent or colored background to confirm the white background is removed