Use below code please, this will work.
<a href="https://wordpress.stackexchange.com/questions/223417/<?php the_permalink(); ?>">read more..</a>
or
<?php
the_content( __( 'more <span class="meta-nav">...</span>', 'themename' ) ); ?>
Use below code please, this will work.
<a href="https://wordpress.stackexchange.com/questions/223417/<?php the_permalink(); ?>">read more..</a>
or
<?php
the_content( __( 'more <span class="meta-nav">...</span>', 'themename' ) ); ?>