I have the same problem, although there is a permalink but I want to have a “Read more” or “Continue reading” link as well.
I know it is possible in functions.php but don’t know what code should be added.
1. Open the content.php
2. Find this line <?php the_excerpt(); ?>
3. Paste this line of code after the mentioned code <a href="<?php the_permalink() ?>" title="Click here to read the complete topic" class="more-link">Read more...</a>