You won't Lawrence. Publisher offers no such facility.
To create animations you need a graphic editor that has an animation
function, such as "Image Composer", "Image Ready", "Canvas", and a number of
other programs. Or, if you want to go one better, you can use "Macromedia
Flash", but the learning curve is steep.
You can also use a marquee to animate text and images provided you have
basic knowledge of HTML.
