How to set up a feedback form when migrating to wordpress?

Question

WordPress

made up the site html css js set up the form validation and form submission using php mailer now all this creativity needs to be transferred to wordpress, everything has been transferred, everything works except for the natural form. I tried to simply transfer the folder with the mailer, but as I understand it, it doesn’t work here! tell me what to do which way to go so as not to remake the window with the form? are there any ways to put the same php mailer only on wordpress on the finished layout and configure it?