To add graphic/picture from a file or disk to your slides choose Insert then Image or click the icon. Go the the file or drive that the graphic is located in/on. When the file has been selected click OK.

Clip Art

To add clip art to your page choose Insert then Image   click the icon. Then in the Image Box click Clip Art. 

The Clip Art box on the left will appear. Choose the image you want and click Insert.