Need to change the time of one of your timeline items? There are two easy ways to do it from the “Edit” view of your timeline:
Direct Edit: Click directly on the time itself and type the revised time into the text box that appears. Then click the “Save” button.
Drag and Drop: Click on the rows of dots on the left side of the particular timeline item. Then drag the item to the desired place in your timeline.
If you need to shift the times of multiple items at once, check out this article.