Web administration password

Hi.
RouterOS default has web administration enabled. Of course to configure you have to put password but for graphs you dont have to login.
And thats my question, i want to have a need of login to see anything on web administration. I know how to change port or disable services but i dont know how to enable password for web administration (i can disable it because i dont need it but graphs are ok).

no way to protect Graphs by login/password