To claim free face and eye creams from Lancaster through a promotional ad on Facebook, first follow or like their page by clicking 'Follow' at the top of any post. Engage with several posts either by liking them or leaving comments before logging out then back into your Facebook app where you should see an advert inviting application details such as name and address for claim processing. If this ad isn’t promptly visible on your feed, adjust your Ad Preferences within the settings to ensure relevance in promotions displayed, consistently interact with Lancaster's content across multiple days or weeks (likes, comments), then periodically check back into Facebook as it may take time for such targeted ads to surface.