Please install and activate the supplied child theme, copy the file single.php from the parent theme to child theme.
Inside the child theme single.php locate this which starts on line 213:
<?php if ($single_author && !$remove_dates) { ?>
<span><?php echo sprintf(__('Posted on <span class="date updated">%1$s</span> in %2$s', 'swiftframework'), $post_date, $post_categories); ?></span>
<?php } else if ($single_author && $remove_dates) { ?>
<span><?php echo sprintf(__('Posted in %1$s', 'swiftframework'), $post_categories); ?></span>
<?php } else if ($remove_dates) { ?>
<span class="vcard author"><?php echo sprintf(__('Posted by <span itemprop="author" class="fn">%1$s</span> in %2$s', 'swiftframework'), $post_author, $post_categories); ?></span>
<?php } else { ?>
<span class="vcard author"><?php echo sprintf(__('Posted by <span itemprop="author" class="fn">%1$s</span> on <span class="date updated">%2$s</span> in %3$s', 'swiftframework'), $post_author, $post_date, $post_categories); ?></span>
<?php } ?>
<?php if ( comments_open() ) { ?>
<div class="comments-likes">
<div class="comments-wrapper"><a href="#comments"><i class="ss-chat"></i><span><?php comments_number(__('0 Comments', 'swiftframework'), __('1 Comment', 'swiftframework'), __('% Comments', 'swiftframework')); ?></span></a></div>
</div>
<?php } ?>
And remove the “Posted on” or “Posted by“.
Thanks.
.