Let me start by saying I am completely new to this and know ALMOST NOTHING about code!

I've picked up just a few bits and pieces on how things work just purely by observation, but really I do not have any sort of real understanding about code.
I would like to instal an html header with clickable links similar to what is on our home page now.
http://digitaldesignden.com/home.html
I assume this is a matter of copying the code from the html file (
but which part of the code?) and pasting it into the header template (
but exactly where in the template?)
If you can help me with this I would really appreciate it so much!!
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No one willing to help out a newbie?