To insert a footer with the file name and path in PowerPoint, follow these steps:

1. Open the PowerPoint presentation and go to the Insert tab.
2. Click the Footer button in the Text group.
3. Choose the footer options – either one of the predefined options, use a picture, or create a custom text.
4. To insert the file name and path, select the File Path checkbox in the Footer dialog box.
5. Click the Apply to All button to have this footer appear on all slides in the presentation.