Use Yoast Breadcrumbs on OptimizePress Pages
You would need to use a 3rd party plugin to make this work as OptimizePress currently does not have a built-in setting for this. Yoast Breadcrumb Shortcode plugin works great with OP though. You can check on the link here for more information on the said plugin and its download link: https://wordpress.org/plugins/surbma-yoast-breadcrumb-shortcode/
In case any issues would arise upon using the said plugin, please contact the plugin author for suggested fix.