To add ClipArt or images to the presentation, click on Insert on the menu bar and then on Picture. If your picture was in a file, choose the From File option. If you want to use PowerPoint's catalog of pictures, select Clip Art and a dialog box will appear with several options.

Make sure the ClipArt tab is showing. Browse through the categories to find a picture you want. Click on the picture to highlight it. Then click on the Insert button.

Once the picture is embedded onto the slide, you can move the picture around. Just click on it and with a four-arrowed pointer (shown below), drag the image to the desired location.

To change the image's size, use the sizing handles (indicated by the black, square boxes). Move your mouse over one of the handles and when you see a two-arrowed pointer (shown below), click and hold the left mouse button down. Drag the mouse until the desired size is met and let the mouse button go.