Using the master site, with one tablet and one phone of your choice. As an student, navigate into a forum. Enter a discussion and check posts have a contextual menu (more icon). Click on one not authored by you and check there's no option available to do (it can show words count, but no edit/delete action). Now enter same forum as teacher. Check contextual menu has a delete option. Try to delete a post (not the main discussion post, just a reply). Check the page is reloaded and the post is deleted. Try to delete the main post of a discussion. Check the page is reloaded and the discussion is deleted.