May sound a little stupid, but Header & Footer? Options

[Jamesisgsnap]

Uhm, yeah. It is stupid And probably a billion topics on this.

But I know how header and footer is supposed to edit every page for you.

I've had a my domain since like before August. And I've had my subby since like January of last year.
Now, Anyways. All those times, I've tried to edit Header & footer, because on MY DOMAIN [No subby]

I have 53 pages, and I don't feel like editing every 53 pages every time I need to add a page.

Now, I don't need the Basic instructions xD.

I need one of those step-by-step instructions XD.
Cause I've done it SOO many times and it NEVER works =/