Single Post Page won't show author

what is the full code of your single.php template?
please paste the code into a https://pastebin.com/ and post the link to it here.

the_author() has to be used within the loop:
https://codex.www.ads-software.com/Function_Reference/the_author

It has to sit after “by” – not 100% about the loop

<script src=”https://pastebin.com/embed_js.php?i=A1B7Eu8D”></script&gt;

<iframe src=”https://pastebin.com/embed_iframe.php?i=A1B7Eu8D&#8221; style=”border:none;width:100%”></iframe>

<?php $author = get_the_author(); ?>

this code does not output anything; it assigns the value of ‘author’ to the variable $author.

https://codex.www.ads-software.com/Template_Tags/get_the_author
https://codex.www.ads-software.com/Function_Reference/the_author

(most functions starting with get_ return the value instead of echoing it)

try:

<?php echo $author = get_the_author(); ?>
or
<?php echo get_the_author(); ?>

Thanks, but no luck. Still renders blank.