After your clip/episode has been imported into your Project Media bin, you can right-click it and these options come up. Click open in trimmer.
Use your mouse to highlight the section you want to trim out of the clip (you don't have to be precise because you can edit it further once it's on the timeline
). Right-click the highlighted areas for another set of options. If you want only the video, you can either click Select Video Only or you can simply hit the Tab key (thanks, Bel, for pointing that out!
). If you want only the audio, then click Select Audio Only (or Shift + Tab). Or if you want both the video and the audio, then you don't have to select any of them (unless Select Video and Audio isn't the default in 9
).
Whatever your choice, you just drag the highlighted area out of the trimmer and up onto the timeline and it's ready to be used!