Once a project has started and the files are loaded you will be able to see them in the timeline. Each clip can be edited individually by right clicking on it, for a tablet or phone just tap the clip. This gives the opportunity to Delete the clip from the timeline, Duplicate it, Expand the audio to see it, or Separate the audio from the clip. These options are also available in the panel on the left on the bottom of the screen, as marked in the image below. If you need to add an audio file, or any other file, you can click on the blue plus sign on the top of the left panel. Rush gives the option of uploading from your own media, creating your own, or using free media they provide.
Desktop or Laptop
Smart Device