1. open PowerPoint through the start menu, Microsoft office 2113.

2. Use the template provided by PowerPoint.

3. Click on the blank presentation to customize the background settings.

4. In the blank, right-click and select Set Background Format.

5. Choose solid color fill and gradient fill, and you can use software to customize and change the pattern.

6. You can also use the picture as the background and select a file to insert the picture.

7. The picture background is set.