1. First you have to enable the Developer tab.
2. Select Developer tab and select More Controls icon.
3. The list pops out. Choose Shockwave Flash Object.
4. Drag a box inside your slide.
5. Right click the box and click Property Sheet.
6. Type the URL of the Flash file in the Movie field.
7. Select Slide Show – From Current Slide to see the preview.
Tips. You can edit your flash in the Properties window. You can change height, width, location and much more.