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Possible Duplicate:
How do comments work?

I found an answer that really helped me. I tried to figure out how I could actually type in a reply (other than clicking on yes it helped me). I could edit the post, but there didn't seem to be any button I could click to add a comment to the answer.

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marked as duplicate by Toon Krijthe, jonsca, BinaryMisfit, yoozer8, Daniel DiPaolo Sep 13 '12 at 19:42

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

You should only post a comment if you need clarification on the answer. If the answer is fine, then just accept it and/or upvote it. That's preferred over "Thanks" and other such comments. – Nicol Bolas Sep 13 '12 at 15:02
Also, you will be able to upvote it once you have earned 15 reputation points on Stack Overflow. – S.L. Barth Sep 13 '12 at 15:07
In should be noted that comments are second class citizens and are not to be relied upon for any longer than the instant you post it. – user7116 Sep 13 '12 at 15:07

Answer to your question

You need rep to be able to comment. As you use the site (by asking and answering questions), you gain "reputation" depending on the votes you recieve. At 15 rep you can upvote a post, and you can comment on all (non-locked) posts at 50.

Answer to your situation

SO is not a forum. The "answers" aren't "replies", they're answers. Similarly, comments aren't really for "thanks!"/etc, they're for asking for clarifications and making suggestions for improvement. Neither is editing for this purpose (as you have realized). Casting an up vote on the post is the best way to give thanks within the framework of this site.

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New users are not able to comment on other people's questions/answers until you have reached 50 rep.

You may want to check out the faq for when you can gain other privileges as well.

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Ok. I just wanted to express my appreciation. Not a big issue. – user1668993 Sep 13 '12 at 15:09
Appreciatian should be shown with an upvote (if available). Many "Thanks" messages just clutter up the site :) – Deanna Sep 13 '12 at 15:46
Why the downvote? – Josh Mein Sep 13 '12 at 20:24

See the privileges for comment everywhere. You require minimum 50 reputation to comment everywhere.

From FAQ on Meta

Who can post comments?

All users may leave comments on their own posts and any answers given to their own questions. Users with at least 50 reputation may comment on any post. (There is no reputation requirement to post comments on MSO.)

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