master / detail problem with operations

Hello, I would need to know how I can do so that in the detail table (of a master / detail) I can edit, delete, or add, how can that be done?even if I go directly to the detail view, I will not be allowed to do any of the three options, if I am going to modify a master / detail record, I just change the record but it does not let me delete, etc.I hope you understand, my English is not so good, greetings from Argentina

You may see the tutorial about Master/Detail in the help file.