Check out this link for a full step-by-step tutorial: http://spectacularprintable.blogspot.com/p/using-word-for-digital-stamps.html.
Another option is to check out Gloria Surr's YouTube tutorial: http://www.youtube.com/watch?v=Blek7tpCkx4.
Still another option is to use Pick Monkey; a free, easy online graphic that you can use without downloading or even signing up! http://www.picmonkey.com.
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Email: SpectacularPrintable(at)Yahoo.com