Go to HELP in PowerPoint and type
It will tell you how to do it.
The picture must be in gif format
(it won't work with jpg
You must insert the picture first.
If this does not work, go to the
MORE menu on a World Builders web page.
Choose Resources and Tutorials and
select the page from the menu that is about
be used by
the author if
you use it at email@example.com