To Make a Transparent background in Canva for free, you can use Canva's transparency tool on the upper right side of the editor. Use the slider to reduce the transparency. Reducing to 0% will make the background image transparent. If you want to make the logo background transparent to layer on another image, you will have to download it as a 'PNG' file with transparent background' option. This option is available on Canva pro accounts only (or a free account with a 30-day Pro trial).