Installation and then?

Hello,
I would like to use Dadi Breadcrumbs on a site. I have installed it and activated te plugin. What do I need to do now for anything to show up?
Excuse me, I’m rather new to WP and not much into php.

I want the breadcrumbs to show up above the title of each page, so from what I guessed out of other breadcrumb-plugins’ installation infos, I suppose I need to place something in the header.php file (?), but what?
Thank you for helping!

https://wordpress.org/plugins/dadi-breadcrumb/