From the Creatives page, mouseover the thumbnail of the video creative you want to edit and click on the Edit button, as shown below.

You can see that the interface is very similar to the static creatives, with the bar on the left containing buttons for adding new content.

The central area to shows the creative itself.

And the right side of the page containing the Formats and Layers panels.

With a video creative though, you will also see the Timeline bar.

An area that allows you to add new scenes, select scenes and the transitions between screens.

To see how the scenes and transitions work, you'll start by adding a new scene to this creative, as shown in the video above, click the Add Scene button now, as shown below.

You should see that the timeline has moved along to show the scene you just created.

Before we customize a transition, change the background color and add a button to the scene, so that you are able to appreciate the transition.

With the new scene ready, you can now click on the transition to that scene, as shown in the video below.

And select a new transition from the transition panel.

Finally click on the play button to see the transition to the new scene at the end of your ad.

Great, now it's your turn to edit a video creative.