How to setup the contact form to sent users' messages?

Hi guys

I bought the YogaFlex (html5) template and I need to make the contact form to send messages.
Is there any instruction/guidelines showing how to do it?

Kind regards

Hey there

Sorry but HTML templates are without any backend functionality, you need to implement PHP file to send forms, unfortunately, we don’t have guideline or tutorial for this because all templates are unique and solution for this question can be also unique