Which file is responsible for the page add the entry (front-end)?

Guys, want something for your convenience to add to the HTML on the country add a record.
I want to put the code or under a field header or right block.
In General, what kind of file displays a template of the admin of this page?
July 2nd 19 at 17:40
2 answers
July 2nd 19 at 17:42
But to edit it is not necessary. To create your blocks admin page has an API
July 2nd 19 at 17:44
If your template is not written. It usually single.php and page.php

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