<p>(<em>I just realized I forgot to make my comment an answer, as requested</em>)</p>

<p>There are a number of possible actions, including<br>
(i) commenting on the answer (to point out where it went wrong) and<br>
(ii) posting a better one<br>
(and - though it's seldom used* - (iii) to correct easily fixed errors via edit)</p>

<p>* and that's mostly a good thing</p>

<p>If you post a good answer, there's some chance the people who know the area you're posting about will recognize the better answer and upvote your answer. </p>

<p>The correct thing for the moderators to do is to respond to any of those actions you can take as any other reasonably high-reputation user on the site might do in response - in their capacity as users - which is to comment, upvote, revert a mistaken edit, etc as appropriate.</p>

<p>As long as you do generally check things you're not completely certain about, you should not fear to post or comment. Yes, you may be wrong - I don't think anyone here is immune from that** - but if you're right most of the time, and you are reasonably diligent, everything will work much as it should. </p>

<p>If you're going to edit other people's answers to correct errors, you need to be much more careful - but even then there's little to fear, because your edits will be reviewed (and which edits might be rejected if they're too extensive, even if they're right). Even if edits go through, they can be reverted. </p>

<p>** (certainly not me, though I could point to a couple of users who are <em>almost never</em> wrong)</p>
