Not sure how to reverse seam

Hi- I am finishing up on a sweater it has taken me a year to knit. Anyway, I am at the point where I have to sew up the sides and sleeves. The Pattern says to -at roll edge of sleeves and body, reverse seam to RS for neater roll. Im not sure what this means. :shrug:. I hope someone out there knows.

Thanks
Beth

Put the seam on the RS or outside of the sweater at that point. When rolled up it will be hidden.