Select "Effects" from the menu below the clips pane. Select
a clip from the editing region to add an effect to it.
Select an effect. Adjust the parameters of the effect beneath the preview
The effect should automatically preview in the preview window. If you
adjust the parameters of the effect, click "Preview" again
to load the new effect settings.
Click "Apply," and wait for the effect to render. You
can monitor the effect rendering by the red progress bar that occurs
within the clip the effect is being added to in the editing region.
Save your work.