Once the video clip is selected, the speed up/down option will appear on the left panel. You can increase and customize the speed of your video to 10x being the fastest.
Q) How do I speed up only a certain part of the video?
A. You can speed up certain parts of your video by cutting/splitting clips at portions of the video you want to speed up, and then adjusting the playback speed for the individual clip.
Q) Can I make my video play in slow motion?
A. Yes, you can. To play your video in slow motion, select the video clip and adjust the playback speed from the left panel by dragging the Speed slider to 'Slow'.