1) to remove AuthImage:
open #/thoughtmechanics/comments.php
remove:
<label for="code"><?php _e("Enter this code: "); ?></label>
<input type="text" name="code" id="code" value="<?php echo ""; ?>" size="15" tabindex="4" />
<img src="/blog/wp-content/plugins/authimage.php?type=image" width="155" height="50" alt="authimage" />
to fix:
install AuthImage plugin (download here and follow the instruction (readme.txt)
2) Also how can I move the text within the comments area just above the RSS feed to just before the comment form to be more centered, rather than at the edges?
Not sure what you mean by "text within the comments".
you mean this - or other?
(Line and paragraph breaks automatic, e-mail address never displayed, HTML allowed bla bla..)