the code is almost exactly like in the docs. It is not showing up. Do I need to add an entry_id or am I missing something else?
{exp:comment:form channel="blog" preview="blog/preview"}
{if logged_out}
<label for="name">Name</label>
<input type="text" name="name" value="{name}" id="name">
<label for="email">Email Address</label>
<input type="text" name="email" value="{email}" id="email">
<label for="comment">Comment</label>
<textarea name="comment" rows="10%" cols="40%" id="comment">
{comment}
</textarea>
{/if}
{if captcha}
<label for="captcha">Please enter the word you see in the
image below:</label>
{captcha}
<input type="text" name="captcha" value="{captcha_word}">
{/if}
<input type="submit" name="submit" value="Submit">
{/exp:comment:form}