Why don't you have narration for Impress slideshow?

I am trying desperately to add narration to my Impress slideshow, but have no clue how to do it. I don’t have any Microsoft programs in my computer and am not willing to add any. Can anyone help me???
Please include directions- I’m computer-stupid!!

It is not clear to me, what “narration” means in context of Impress. Please try another wording.

I presume this is what you’re looking for?