Hi @nachham! There is no need to do the steps described in the link you posted. Certificates are enabled by default in Tutor. However, the “certificates” menu is not present in /admin but in the Course settings menu in the studio. For instance, go to: https://studio.demo.openedx.overhang.io/course/course-v1:edX+DemoX+Demo_Course (login: admin@overhang.io password: admin). In the “Settings” menu, there is a “Certificates” entry.
If you really want to access the django admin menu, then you should access it from the LMS (myhost.com/admin and not studio.myhost.com/admin).