So I go to File > Print Preview and see that my settings do not correspond to index card sizing. I can print but not Index Card sizes. Then I click on Page Setup > Paper Size, drop down box, and there is nothing to change to Index Cards. 
So I go to File > Print Preview and see that my settings do not correspond to index card sizing. I can print but not Index Card sizes. Then I click on Page Setup > Paper Size, drop down box, and there is nothing to change to Index Cards.