Write the address on the right side of the card. kinds of postcards), you will need to put a st. Look for signs of where to put an address. The address is normally placed on the right hand side of. Oct 26, 2016 . Learn how to address a postcard with our guide on addressing rules, what to write. The first step for addressing a postcard is to identify the correct side for writing the address -. The only text allowed in the addressing area is the recipient mailing address. Any graphics, text o. The PostalMethods postcard has - prepare for a big surprise - two sides: PostalMethods Postcard - I. I put this on first so that I don't cover up any text I put on the card.2) Do not. putting t. No, you don't have to. You can always exchange addresses after a postcard is received, through.