Which tab should you open to find the option for adding a header?

I normally just double click randomly on the page and I get the header. Laughing Out Loud.    

(trying to keep my useless answer it formal)

solution:

the auto-correct option of the auto-correct tool enables you to add and delete words that do not follow abbreviation rules because:

it is a feature that allows outlook to correct common spelling and typing errors and to replace characters with symbols. we can also can use auto-correct as a shortcut, which means we can type a small string of characters and have those characters replaced by a longer string.