I have Window 7 with Office/Word 2010. Yes, the Header & Footer ribbon appears, but that in itself is no solution to the problem of STOPPING the H&F from repeating on page 2 and all subsequent pages. THAT is the problem.
My Header is a stylised home postal address. When I type a letter of more than 1 page, the Header keeps repeating on page 2 and subsequently.
No one has yet explained to me how to STOP the repeating Header.
This is a deficiency in Word that Microsoft needs to address.
That was not what you asked this time. I missed that you were the original poster and still don't get it.
This time, you asked where to find the control for different first page. That is the question I answered.
Suzanne has again answered your original question. I suspect it was answered a number of times already in this thread, but haven't read it recently.
Header/Footer Settings Recap
Here is yet one more answer: How can I get a different header/footer on the second page?
Look on my downloads page for the Basic Letterhead Template. It has no macros. It uses Word features including the different first-page setting,
MacroButton Fields, and the StyleRef Field. These are examined in the Letterhead Textboxes and Styles Tutorial.