It's easier than it may seem. First, you need to open Adobe After Effects. You'll see a program with a lot of features, but don't worry, it's straightforward. Find the project window, and there open different folders: Edit Here, Assets, Footage, and more. Select Edit Here for the changes. You can choose what exactly you want to edit: music or scenes in the window that appears. You also can import your video by clicking the left mouse button, add texts, and additional information. Also, please read our article The Best After Effects Beginner Tutorials. Here you will find detailed information with video explanations of how to make amazing designs.