add content page doesnot work for other users
you should include print render($page['content']); in your page.tpl.php file otherwise, it will not display content for the page.

content is default block which Drupal use to render content of a page.

If you do not want to use content region in your theme, then you can set View the administration theme permission for your user role.

Setting permission:


Go to  Administration -&gt; People -&gt; Permissions
Checked check-box of View the administration theme for your user role and save form.