Code to add the author to the meta function of the sela wordpress theme. Answer for forum topic on wordpress.org https://wordpress.org/support/topic/meta_data-add-author-in-frontend?replies=1

selena-add-author-child-functions.php

if ( ! function_exists( 'sela_entry_meta' ) ) :

	function sela_entry_meta() {
		// Sticky
		if ( is_sticky() && is_home() && ! is_paged() ) {
			echo '<span class="featured-post">' . __( 'Featured', 'sela' ) . '</span>';
		}
		
		echo '<a href="' . get_author_posts_url( get_the_author_meta( 'ID' ), get_the_author_meta( 'user_nicename' ) ) . '">' . get_the_author() . '</a>';

		// Date
		if ( ! is_sticky() ) {
			sela_entry_date();
		}

		// Comments
		if ( ! is_single() && ! post_password_required() && ( comments_open() || get_comments_number() ) ) {
			echo '<span class="comments-link">';
			comments_popup_link( __( 'Leave a comment', 'sela' ), __( '1 Comment', 'sela' ), __( '% Comments', 'sela' ) );
			echo '</span>';
		}

		// Edit link
		edit_post_link( __( 'Edit', 'sela' ), '<span class="edit-link">', '</span>' );
	}

endif;