Hi Lhachen,
We are happy to guide you in using the features of this Samsung refrigerator model.
The genuine water filter that comes with the refrigerator does not need to be turned on anymore. When the water filter is installed correctly, it passively works when the refrigerator is connected to a water supply line. The water filter is located in the fridge compartments lower right-hand side.
The refrigerator has a control/feature panel located in the fridge compartments right-hand side. The panel will have a button labeled Ice Maker with corresponding indicators above it (Ice Maker On and Ice Maker Off). I have shared this model's user manual link below for steps to take to enable the Ice Maker.
https://downloadcenter.samsung.com/content/UM/202002/20200201091442956/SBS_RS5300T_DA68-03958J-01_EN-MES-CFR.pdf
Should you need more assistance with your refrigerator and how to use its features, please feel free to get back to us via the following options:
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
When you message us, please provide us with this reference number 1148421091 to help our team pull up your information.
Leo