Basically you go to the eCard page and select the eCard you like, then select a song if that option is available.

Fill out the card, your name, your e-mail address, then fill in the e-mail addresses you want the card to go to. You can send the same card to many e-mail addresses at the same time, just put a comma between each email address.

Then in the last box, fill in a message.
Scroll down and check the 'Notify Me...' box if you want to know when a card has been picked up.

Then press the send button to send the card. :D