Double click the software icon to start Filmora9. That will open the "get-started" window, where there are 3 ways for you to proceed: the Project Library, Open Project and New Project.
1. Project Library
In the Project Library, you will see your most recent projects ordered by the dates they were last modified. Double click on a project to open it. You can also delete projects by clicking the Trash icons on the right side of the window.
Typing a project name in the search bar is another way you can find a specific project.
2. Open Project
Click on Open Project to choose from the projects (.wfp files) saved on your computer.
3. New Project
Select an aspect ratio from the dropdown and then click on New Project to enter the editing interface and begin a new project.
No matter which of the options you choose to enter the program, it will open to this editing interface:
Filmora9 also has a number of features tailored to GoPro and action cam footage, and an Instant Cutter for lossless clip trimming. Please visit this Action Camera Video Editing guide to learn more.