First of all we’re really sorry that you’re having issues. Now about the issues can you please provide a temporary admin access in a private comment with page links where you’re having issues?
About the breadcrumb https://themes.themeregion.com/playbit/demo4/playbit_event/ this link is not valid link for playbit_event it’s just loading WordPress default blog style. Main style for event listing is this page https://themes.themeregion.com/playbit/demo4/upcoming-events/ You can set breadcrumb image from perspective page settings in edit page.
And about blog page those are given in option panel.