About the Author

Open author.php and delete these lines:

<?php if ( have_posts() ) : ?>
    	<header class="main-page-title">

        	<h1 class="page-title"><?php the_post(); printf( __( 'All posts by <span>%s</span>', 'acosmin' ), get_the_author() ) . ac_icon( 'angle-down' ) ?></h1>

            <aside class="about-share clearfix">
                <div class="as-wrap clearfix">

					<?php
                        // Variables
                        $author_id			= get_the_author_meta( 'ID' );
                        $display_name		= get_the_author_meta( 'display_name', $author_id );
                        $user_url			= get_the_author_meta( 'user_url', $author_id );
                    ?>
                    <div class="about-the-author clearfix">
                        <h2 class="title"><?php _e('About the author','acosmin'); ?> <span class="author"><?php echo $display_name; ?></span></h2>
                        <div class="ata-wrap clearfix">
                            <figure class="avatar-wrap">
                                <?php echo get_avatar( $author_id, 58 ); ?>
                                <?php if( $user_url ) { ?>
                                <figcaption class="links">
                                    <a href="<?php echo esc_url( $user_url ) ?>" class="author-link" title="<?php _e("Author's Link", 'acosmin'); ?>"><?php ac_icon('link');?></a>
                                </figcaption>
                                <?php } ?>
                            </figure>
                            <div class="info">
                                <?php echo esc_html( get_the_author_meta( 'description', $author_id ) ); ?>
                            </div>
                        </div>

                        <div class="clear-border"></div>
                    </div><!-- END .about-the-author -->

                </div><!-- END .as-wrap -->
            </aside><!-- END .about-share -->

        </header>
    	<?php endif; ?>