For seams, peel back 5/8" of the backing that you applied in the first step. Overlap the pieces to stick them together, then layer the seam with a piece of duct tape on the front. Fold the duct tape over at the edges of the garment that will show, like the top of the bodice. Cut the tape where you are going to be joining another piece, like at the bottom of the bodice.
Next, let's see how to deal with gathering and hemming your dress.