Add siple e-card to Drupal-site

I am an artist. My website is [login to view URL], build in Druap 7. What I need to do is build a webshop to sell my paintings. That is for later. What I would like now is an option to be able to send an e-card. The module exist but I don't find documentation. The card will be the paintings I make. They will be in a specific folder. A user must choose a painting that he can send to an e-mailadres, there must be a field to add some extra text.