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Click on HEADER & FOOTER from the VIEW menu.
Or click on the Header & Footer icon at the TEXT option from the Insert tab.
Type the text you want to set.
Click on GO TO HEADER / FOOTER at the NAVIGATION option from the Design tab to move from header to footer or from footer to header.
Click on the main document after ending the text.
You can insert Date, Time, Page Number etc. in the header or footer.