It says to enter a comment when I click on the green square but then it claims I gave 0 rep points.
What am I doing wrong?
You're not doing anything wrong. Your reps won't visibly increase another user's rep count until you have at least 50 posts. However, the comment that you leave them will be visible to the user and is a nice way to still say "Thanks' Once you've reached 50 posts, then your reps will increase their rep count.
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