( Read this step-by-step tutorial to learn how to perform a basic video-editing operation with QuickEditor. )

Every Editing Session is started by Opening or Creating a MOVIE.
MOVIE Panel. Any QuickTime movie can be opened in the MOVIE Panel, using the Open MOVIE... command in the File Menu, or the "eject" button on the MOVIE Panel . You can also create an empty MOVIE with the New MOVIE... command in the File Menu.
MOVIE Panel (Eject Button)
Now that a MOVIE is open, let's delete part of it.
3) Select the part of the MOVIE you want to delete (step 1 of 2). Go to the beginning of the sequence you want to remove, and press the "Set Start Point" button on the MOVIE Panel.

4) Select the part of the MOVIE you want to delete (step 2 of 2). Go to the end of the sequence you want to remove and press the "Set End Point" button. The sequence located between the Start and End Points is called the Selection.

5) Remove the Selection from the MOVIE. Now that you have selected the sequence you want to remove from the MOVIE, proceed with the editing by selecting the right command in the Edit Menu.

The Selection has now been deleted from the MOVIE.