How to change a form end email?

In admin, check the page template used by the contact page, and look for it in your theme folder. Page templates are applied as described here:

https://developer.wordpress.org/themes/basics/template-hierarchy/#single-page

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)