Merge doesn't happen unless you have setup your postcards to merge.
What version Publisher are you using? If you are using 2007, use one of the
Avery templates.

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Mary Sauer MSFT MVP
http://office.microsoft.com/
http://msauer.mvps.org/
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> How do I print just one side of my postcard in publisher? My print options
> always say print merge and then it doesn't give me options to print only one
> side at a time.