One of the things everyone is stressing to me as a relatively new Drupal Developer is to NEVER modify the core.
I installed a theme on a site, but do not want the "Submitted by Joe Smith on Friday September 17" lines to appear.
I could not find the "submitted by" field as an option under "Manage Display" to move it to hidden for the default article type. All I saw were "Image" "Body" and "Tags" fields. I successfully hid the "Tags" field by dragging it to the "Hidden" area of "Manage Display".
I was able to find the code that writes the "Submitted by..." text in the node.tpl.php file that was part of the theme so I deleted the following three lines which accomplished my goal.
<?php if ($display_submitted): ?>
<p class="submitted"><?php print $submitted; ?></p>
<?php endif; ?>
My question: is this OK or is changing a theme this way considered changing the "core"? If it is changing the core, what would be the correct way to remote the "Submitted by" information from a page if it is not exposed as a field on the form?