If you each record in the table can be accessed by only ONE person (never two people or more can access the record), then make a field in the table called UserID, or CreatedBy, AccessedBy etc, whatever name you feel is appropriate.
Everytime they open the view/edit form, it must filter to show only the records where UserID in the table = UserID currently logged in.
Everytime they add a record, you need to make sure in your routine somewhere that UserID gets set to be the UserID that is adding it (currently logged in).
If multiple people need access to the same record, create a junction table between that table, and the User table. On the form, have a subform where you as the admin (or whoever has the power) can select multiple users from a dropdown to have access. And as above, the form needs to be run on a query where the UserID is present in that junction table, for that record.