Include php pages in wordpress pages

I’ve no idea what I’m meant to do?

What do I change in each of my 7 pages exactly?

I tried making that snarfer.php and then putting the same code at the top of my other pages but nothing changed.

I understand the part about creating a new template. but do I go to add a new page, and copy the PHP code from my file into there? Cause that didn’t work.

I get you now. Create my new page, and then set the template as that page?

I did that, but my new page just displays as normal. It’s not wrapped around my wordpress site. This is how my page looks.

[Code moderated as per the Forum Rules. Please use the pastebin]