To insert a page number, click on the very top of the document until a line appears.  This line separates the header from the rest of the document.

Click Insert > Page Number.

Select the image which shows a page number beginning on the first page in the right hand corner.

Once the page number appears in your header, type your name in front of it, followed by a space.  Move this until it is right justified, or right against the right margin.