1. First open the PPT to be edited, insert the picture, and click the "Format" option.

2. Then click the "Icon Border" option in the new pop-up page.

3. Then click on the new pop-up page to select the next favorite color under the theme, which is to add shading.

4. Then click the "thickness" or "dotted line" option in the newly popped up page to add a border.