What Charles described is exactly the way we do our letterhead. I have it sized to precisely 8.5 x 11 inches (US letter size), and I see your standard is A4 size.
I selected your image, cut it to the clipboard, then inserted a header and pasted it into the header. Because you had set your margins to zero, I couldn't click into the header automatically. Presuming it's already the right size for your page, from there you'll want to right-click the letterhead image, choose Size and Position, and I generally set my alignment to Centered relative to Page, both horizontal and vertical. I deselect Move object with text in case anything else gets typed in the header or footer.
At that point, before you close the header/footer, I'd keep that image selected and click on the Insert ribbon and find the Quick Parts button about 2/3 of the way to the right. Choose Save Selection to Quick Parts Gallery, and when that window pops up, change the Gallery from Quick Parts to Headers, give it a name, and then you can insert that as a first-page header with just a click or two, centered and the right size from the Insert/Header button.
I changed your margin in the attached, because the margin affects the text on the page, not that background letterhead image.
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