If you are trying to remove an eCard that has posted to your Facebook wall or timeline, please follow these tips:
1. Login to your Facebook account and find the post. Click on the 'pencil' icon in the upper right and click 'delete' to remove the eCard from your timeline.
2. If you need to deactivate the url link of the eCard you can do so from the 'my eCards" tab which you can find here.