If you added several items, but find you don't need them all, or you need to quickly delete the items and start over, the move tool allows you to select multiple items on page (links, images, video clips) and delete them all at once.

To start, you'll be in the Multimedia Manager:

Click on the Move tool: 

You will see the items on the page highlighted as well under the Items on Page box:

Click on the trash can icon to mass-delete the items on the page.

Remember to save your work if you do not plan to add new multimedia elements immediately.