Send to Friend
To add a 'Send to Friends' link in your email campaigns first create a 'Send to Friends' form in the 'Forms' section of Lead Liaison (top right side of email and survey designer/builder).
To do this go to 'Create Website Forms' and select 'Form Type->Send to Friend'
Continue through the process in the same fashion as you would create any other form type. Once it's been created, you can now add this to your emails.
To add the 'Send To a Friend' to your email campaigns add it in like any other 'Custom Field' and send it out -- Simply click on the 'Insert Custom Field' button on the editor or the link underneath the editor.