Wificus

I'd really appreciate if someone can clarify step 5. It says: "Turn the fabric and interfacing piece right-side out, pushing out the corners. Next, with right sides together, place the fabric piece inside the lining. At the top edge, sew one side of the lining to the fabric piece, using a 1⁄4-inch seam allowance and starting close to the previous sewing. Repeat on the other side."
So when I place the fabric/interfacing piece inside the lining the rights sides are together, correct? And then according to the picture, it looks like I sew them together & in step 6 it says I will have a "clean edge at the top" but if I sew them together, where is the opening to the purse? I already made two purses, and these directions really confused me, so I deviated from them at step 5. I'd love to know what the creator was doing though.
Thanks.