Hello. I added zones, ads, I added code to head section and snippet into places that should display ads on: http://kupie-sprzedam.felcia.co.uk/index.html but nothing is displayed.
I see that script work and changes snippet:
<div class="adplugg-tag" data-adplugg-zone="felcia_1-top" data-adplugg-regid="0" data-adplugg-processed="true"></div>
But there are no ads.
To close. Now I see there "-" sign is changed into "_".
Great, glad to hear that you figured it out! Sorry for the trouble, that's a bit confusing. If you don't mind, it would be awesome if you could add your solution as an answer below and accept it so that it can help others that might run into the same issue. Thanks!