A teacher may mark an activity complete on behalf of a student from the Activity completion report if they have the capability Override activity completion (which is enabled by default.)
To do this:
- log in and go to your course
- go to Administration> Course administration> Reports> Activity completion
- tick the appropriate box
- agree to the change
- if you tick the wrong box, re-clicking on it will remove the tick.
- when the teacher overrides in this way, the box is marked red