Problems with UMI.CMS, how to add a subpage?

Question

CMS

Hello. Accidentally deleted a subpage with news and promotions in the UMI.CMS admin panel:

Here's how the news looked in the frontend:

Now I don't know how to get everything back, because I'm not very familiar with this system.
Another problem, when I tried to fix the issue, added a new page and edited its "data type". Then I deleted this page, and now I can not add new ones. An error:

Answer 1

The page can be restored through the "Cart" module. To add a new page, click the "+" image when you hover over the page (or the site name in the structure itself).

Answer 2

Now I do not know how to return everything back, because I am not very familiar with this system.

lukinov93 The
page can be restored through the "Basket" module. To add a new page, click the "+" image when you hover over the page (or the site name in the structure itself).
--------------------------
apparently, under the words "edited its" data type "hidden actions? that violated the bindings between the base and object data types. Describe what exactly did you do?