You must create an event before you can send an invitation. If you have not created an event yet, please review this tutorial first: Creating and Managing Events.
Step 1. Create an eCard as usual and then on the edit message screen, tilt down the menu for "Include Event RSVP" and select one of your events. (see example) Click 'Add Event Text to Message' if you want your event information inserted into the eCard. You can then edit this text within your eCard to include as much or as little information as you want.
Step 2. Send your eCard to your recipients and they will automatically be added to your invitation list. Your eCard recipients will now be able to click on the RSVP link to respond to your invitation. (see example)
We recommend creating an invitation and sending it to yourself first, so you can see your recipient's experience and then adjust as needed. When you're happy with your online invitation, go to your 'Sent Cards', find your invitation and either copy the eCard or make it into an eCard template. You now have an exact duplicate of your invitation that you can send to your contacts. Don't forget to check out our tutorial: creating invitations and saving eCard templates.