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I must admit that I haven’t tried it myself yet (I keep remembering that right after I hit the “publish” button), but as far as I know, yes, that’s the only thing you need to do.

I did it and I got a comment from commentrewarder that I am rewarding zero comments, even as I got comments from people on the post.

Good question, I’m new here. Don’t know.
Is there a help forum?

Yes.
The best help comes from the person who introduced you to hive.

Or thrown questions on waves like I did.
Or chat on discord groups.

You must give the comments you want to reward a small vote.

Oh
Okay.
Thank you very much ma'am for this.

The only thing left to do is to vote for those comments you wanted to reward.

Alright dear
Thank you very much 😊

You are welcome 🤗 happy rewarding those beautiful commenters.

Thank you very much dear 😊