Yes, you can mark a post in the discussion forum with an asterisk, which can be found next to the "Reply" button.
1 Starring a particular post will put it in your favourites list, so you can return to it later.
An overview of the posts marked with an asterisk can be found on each page of IS AMBIS in the upper right corner under the asterisk icon. When a post expires in the discussion forum, the asterisk will be deleted and the post will no longer be available in the overview of marked posts.