printing 3.5x5.5 cards

[Barbx4]

I am trying to print a 3.5 x 5.5 card.  I am working with Word on a Mac.  I went to manage size and created a size - 3.5 x 5.5. , typed my message, hit print - (printer Hp ENVY 5540 All-in-One); I changed the paper size to the one I set up but it will not print.  The printer keeps telling me the paper is not the same size selected.  On the printer screen 4x6 is selected.  How do I print my size?  Any help is much appreciated.  

barbara McLendon

[8lives]

Custom-sized media for Mac OS X.

89.9 to 215 mm (3.54 to 8.5 inches) x 127 to 317.5 mm (5.0 to 12.5 inches)

Take a look at this HP doc.