Hi, Edzard
When edit page, you can build it with elementor page builder widgets like screenshot,
https://prnt.sc/uc3266
You can use default elementor widgets and our lorada elementor widgets.
Please drag & drop the widgets and build your pages. How did you get "Please select a valid product" message on your end?
When build pages, please drag and drop the elementor widgets(default widgets & lorada theme elementor widgets) on your page content.
If our solution is not enough, please contact us again without hesitation.
Best Regards, C-Themes
Hi, Edzard
Could you share your site URL and admin credential?
Then, we'll check your website in detail and provide the solution correctly.
Best Regards, C-Themes