1. First open the volcano video and click the "+"sign below, as shown in the figure.

2. Turn on the camera and click the "Shoot" button, as shown.

3. After shooting the video, click "Special Effects", as shown in the figure.

4. Click "Time Effect" in "Special Effects", as shown in the figure.

5. Select the "Back in Time" effect in the time effect, as shown in the figure.

6. Finally, click Finish in the upper right corner to end the video shooting and complete the renderings.