How to achieve Prevention of New Threads in Moodle Forum? (To remove the "Add a new discussion" link on the students' pages)
For some standard discussions, you may want to limit students to replying to specific threads rather than have them post new threads. For instance, you might want them to choose one of two or three topics to reflect upon. If you don't control their ability to add new threads, the forum can be somewhat chaotic, with students adding topics willy-nilly. Instead, you can add a post for each topic and then eliminate the "Add a new discussion" link for students, allowing them only to respond to your initial threads.
To remove the "Add a new discussion" link on the students' pages, you'll assign a No New Threads role to your students.
How to do it?