Open your video-editing software, such as Movie Magic, the Adobe Premiere suite or the Pinnacle Studio suite.
Open your movie file and go to your timeline. Find the area in which you want to apply a special effect.
Open the video effects option in your drop-down menu. Scroll through the options to determine which effect you would like to use.
Double-click the thumbnail of the effect you have chosen. This will let you preview how the effect will look on your timeline.
Apply the effect to your video by grabbing the selected effect with your cursor and dropping it onto your timeline where you want the effect to go.