As an admin you can see Moderate button in a forum view. Use it.
Bad advice. I clicked the Moderate button. It took me to the same forum with the same topics, now with checkboxes by each topic and a Delete Topic button. I checked the link I wanted to remove and I clicked the Delete Topic button and, sure enough, the entire topic was deleted, not just the link. There should be a Delete Link button, but there is not. Now maybe I will re-create the topic, but it wasn't that important. Just be careful. This poorly documented forum, and these poorly explained replies can get you into trouble.
Steve