How to blur the background in Canva

1. First click on the "Apps" icon in the left sidebar
2. In the search bar at the top, enter "Blur Background" to find the app
3. Click on the "Blur Background" app from the search results
4. Click the "Use in existing design" button in the app preview window
5. Select "Your projects" from the folder selection dropdown
6. Click on "Untitled Design" from the projects list
7. Click the "Choose file" button to select a file to input
8. Then click the "Blur background" button to generate the new image
9. Finally, click the "Add to design" button to apply the blur effect