Hi @N,
Okay, I got it. You mean to display the date on breadcrumbs section while visiting the single post page same as the demo.? For that please go to Dashboard->Settings->Permalinks and choose Date and Name radio options and save the settings.
Let us know if this helps or need more help please do reply.
I would like to ask you a favor N. Would you mind taking a few minutes to write a review for me, please? Your comments help others know what to expect when they’re looking for the theme we offer.
Link to rate our theme: https://wordpress.org/support/theme/yugen/reviews/?filter=5
Thanks for using our theme N. I’m looking forward to reading your comments.
Thanks!