But I suspect what you need is to hide part of the content of a page only, possibly showing one section to logged-in users and a different section to guests that tells them to log-in or register. You wrap content with the toolset_access shortcode, as described here: https://toolset.com/documentation/user-guides/access-control-texts-inside-page-content/
Thanks for your help, I can not find the "Contact advertiser" page id 7778.
Since I would like to display a message that only registered users can see this section.
Is this a page in your screenshot or a post generated by a template?
In any case, you should be able to edit the page or template and wrap the relevant section with toolset_access shortcodes that you can generate using the Access button which appears above the editor.