Go to the Redeem Link tab and select which list you wish to target. When a list has been selected the associated link will be shown. Copy it and use it as the Web Address (URL) for a button or a hyperlink in your email. This link contains a special merge tag that will be replaced by the subscribers email address once the email is sent to a subscriber.
To test the link you can send the email to yourself. Keep in mind that the link will only work if the recipient email address exists in the targeted list. So if you send a test email to yourself you need to make sure that you're also added to the targeted list.
When a subscribers lands on the landing page we check to make sure that the requested email address actually exists on the list. This is to prevent people from changing to another email address in the link in order to receive multiple codes.