After the above settings enabled you will find a certificate tab when login in Lms as a instructor.
1)So enable the field of a model in Lms admin.
2)login as instructor in Lms.
3) open a course .
4)click instructor tab .
5) then u will find certificate tab(which is enabled becoz of above settings)
6) click on certificate tab
7) then u will a button labelled Enable students certificate.
8) click it.
9) then all students who are enrolled in honor mode and has passed the course will find option to generate certificate in the 'progress'tab.