Hi Jane-
You just need to treat it as a 'label'...
If you already have a postcard document saved, type the content into one of
the 'postcard cells', then go to Tools>Letters & Mailings>Envelopes & Labels.
Click the option button for 'Single Label' in the lower left corner of the
dialog box & specify which of the 4 label positions your content is in, then
click Print.
If you don't have a postcard doc yet, first go to Tools>Letters &
Mailings>Envelopes & Labels, click the Options button & select the correct
Avery number (probably 3263), then click the button labeled 'New Document'.
Save it with whatever name you wish, then follow the instructions above to
print your postcard.
HTH |:>)