How to connect a form from a site to PHPmailer?

Question

PHPMailer

Good day everyone!
I've been designing websites for about a year. Friends approached me for help and I immediately agreed, believing that it would not be difficult. But having climbed and read, I realized that everything is not so simple in reality.
The point is this. You need to send data to the mail through the form of a modal window that appears when you click on the "make an appointment" button (here is the address of my hosting. You can see - cj25858.tmweb.ru ).
In the form you need to enter the name, phone number, indicate the specialist and by clicking on the "sign up" button, all this stuff should fly to the corporate mail.
I found a suitable library with which this can be implemented. PhPmailer is called. The problem is that in PHP I am absolute zero. Programming languages ​​are hard enough for me so far. I make up a year.
Maybe there are wise people here and will help. So you don't want to let anyone down. Help guys. matter is important.