<human>:  How do I edit a video using iMovie?
<bot>: To edit a video in iMovie, open the program and click on the "Create New" button. From there, you will be prompted to choose a template or import a video from your device's gallery. Once your video is imported, you can start editing it by adding and arranging clips, adjusting sound levels, and adding other effects to the video. You can also trim the video and adjust the speed of the video clips. When you are finished, you can export your video or save it in various formats.