How to add a transition between 2 video clips

To add a transition between two clips, do the following:

1. Click Transition to open the transition effect panel. 
2. Drag and drop the transition you want to the videos where you want to insert a transition effect.

Tips:
1. The transition may be too small to edit or see on the Timeline. If so, click Zoom in to see it and edit it.
2. Drag the two end of a transition to adjust it duration, or click the Edit button to get more tools for editing.
3. Click Apply to all to use the same transition on all video clips.
4. Click Random to all to use transitions chosen by the software automatically.