1. Download someone else's earring video from its source to the device. This can be done using a browser or a specific download tool.

2. Open the video editing software and create a new project.

3. In the option of importing software or media files, select the earring video file that has been downloaded to the device and import it into the project.

4. On the timeline of the software, find the imported earring video file and drag it to the desired location.

5. Trim, edit, speed up or slow down the video until you are satisfied.

6. Save the editing work and export the final video file.