How to Add “login to post” in all topics for guest

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Currently for guest users, when they visit a forum topic, they are only allowed to read. They can’t like or comment. You can check what I mean HERE

The above is okay, but for some persons they don’t know they can actually reply a post or like the topic.

So I want to add “Please Login or Register to like post or reply” at the bottom of each topic boarder. The login and Register should have the appropriate links.

Thanks