how do I get a like button?

How can I make a like button and also how can I make it show who liked the post?

Thanks in advance!

Here is a tutorial to add a like button to messages, but it does not show you liked the messages - https://help.forumotion.com/t108561-a-new-like-dislike-system-phpbb3-and-invision#709635

Thanks. I tried it for invision, but it doesn't appear to be working. There was already a bunch of code in the CSS style sheet; I just put the new CSS stylesheet code under all the existing code. Could that have affected anything? Or do I need to enable the points system? Or do I need to wait a certain amount of time?

Yes you need to enable the reputation system.

The CSS should not affect it, as long as its all valid.

Thanks so much! It is working now!