Click the picture button "Add Clipart " on the left toolbar, you will see picture browser pane on the left. You can select a clipart type from the clipart type drop-down list. There are four built-in clipart types available: Gift, Text Box, Cartoon, Decoration. Select a clipart type and all the cliparts of this type will show in the clipart pane below. Double click or drag a clipart to add it to the current photo.

Note: You can rotate, shadow, transparent, and delete an added clipart, you can also click and drag it to the place where you want  it to be.