Click on the icon “Postcards”. In the next screen, select “Send postcard” at the bottom of the screen. Take a picture or upload a picture from the photo album of your mobile phone. You can add a short text in the description. This will be placed on the back of the postcard.
If you press “preview”, you will get the preview of the postcard you want to send. You can send the postcard by clicking on the “send”button at the bottom of the screen.