Hi @Li_Yang ,
So to create a RLS for your dataset, you will need to create another document (like an excel doc) and in that, you will put into columns the users/groups you want to apply RLS to and in another column, you will add the rule or rules. I would refer to this resource for more details in terms of an AWS resource perspective (Using row-level security with user-based rules to restrict access to a dataset - Amazon Quick Suite). Moreover, there is also an old community post that includes a video that helps visually break down the steps. It is a bit of an older video but I believe the contents are still just as relevant. Here is the post (Applying row-level security to the parent dataset - Q&A - Amazon Quick Suite Community).
Let me know if this helps!