you can use wp_lostpassword_url, or you can directly echo it wherever it’s required just by
<br />
<a href= "https://wordpress.stackexchange.com/questions/306570/<?php echo wp_lostpassword_url(); ?>" class="neolog"><?php _e('Not a member?','text-domain'); ?> <span><?php _e('Request an invitation.','text-domain'); ?></span></a>
You can visit WordPress Codex for more info.