Here are two ways that you can adjust the speed of a video clip in Write-on Video.
Select a clip that you wish to adjust the speed.
Tap on the Speed button and choose the speed.
Or, you can left-click on a clip, choose "Speed", and enter the speed in the pop-up window.
110%: means to play the video 10% faster than the original speed.
-10%: means to play the video 10% slower than the original speed.
The total length of the video will be showed below.