Help with PHP mailer form on GoDaddy host

Hi. I am hosted on GoDaddy (bad choice, I know), and am trying to write a form that will send me an EMAIL with the form details, and won’t redirect the client to another page. Tried already reusableforms.com, gave me a 405 (?) error.
I am a junior web dev, do know the basics off html, css, javascript and some php.
that’s the page address: https://www.lutrail.com/sleeping-bag-local1.html

mail()
PHPMailer
SwiftMail
MailGun

Those are options.

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