I sewed a piece of the shade tape to the decorative fabric, horizontally and about 2 inches up from the bottom. When you sew it, make sure the opening for a dowel rod is towards the bottom edge of the curtain or it won't sit right. Sew another strip of the shade tape around 6" - 9" away from that. You can use whatever spacing you want between the strips, just be consistent. I also found it helpful to go ahead and use the walking foot to make sure nothing shifts. Continue to sew the strips on for the full length of your shade.
Next, layer the decorative fabric and the lining or blackout fabric, right sides together. Sew along the sides and bottom with a 1/2" seam allowance (leave the top open).