To add a pop-up to your paper greeting card, you'll need to purchase some specialty paper and a pop-up mechanism. First, cut out the shape of the pop-up from the specialty paper. Then, using the pop-up mechanism as a guide, make corresponding cuts in the card itself. Finally, fold along the pre-cut lines and secure them in place with adhesive. You could also purchase a pop-up card kit. Using the template provided with the kit, fold the paper along the indicated lines. Finally, use glue or double-sided tape to attach the shape to the inside of your card. Your recipient will be amazed when they open your card, and the pop-up jumps up.