Hi summysing,
Thank you for reaching out, and we hope you are in good health. We appreciate your interest in Samsung home appliances, specifically with Samsung - 27.8 Cu. Ft. 4-Door Flex French Door Fingerprint Resistant Refrigerator with Food ShowCase - Stainless steel.
Your appliance is frost-free, which means there is no need to manually defrost your appliance. This will be carried out automatically. I have shared the user manual link below. Please access the link and turn to page 13 for tips on proper usage.
https://downloadcenter.samsung.com/content/UM/201705/20170511145930225/DA68-03378H-01_MANUAL_USERS_EN.pdf
Please feel free to communicate with us through the channels below if you have additional questions.
1. Facebook Messenger: http://m.me/samsungsupport
2. Twitter: https://twitter.com/messages/compose?recipient_id=18768513
3. Samsung Community: https://us.community.samsung.com/t5/Samsung-Community/ct-p/us
Your reference number: 1144649731
Leo