hide author, date and tags

Hi,
I’d like to remove “author” and “date” from posts.
I tried to remove following lines from CONTENT in folder JUSTWRITE > POST TEMPLATES but it doesn’t work. Can you help me?

<time class=”detail left index-post-date” datetime=”<?php echo get_the_date( ‘Y-m-d’ ); ?>”><?php echo get_the_date( ‘M d, Y’ ); ?></time>
<span class=”detail left index-post-author”><?php _e( ‘by’, ‘justwrite’ ); ?> <?php the_author_posts_link(); ?></span>

thank you
Francesco