Okay, I tried both methods, and here is what worked for me. The nicely pressed fold line is very important. I used a pin to match, say, the tip of a flower to the tip underneath so that they were lined up on top of one another. I tried using glue, but my fingers kept getting in the way, and I found I kept moving the fabric out of line too much. So I did a few matching flowers pinning, and then taped, then did a few more and continued taping. Now, I had a tough time figuring out how to lay the fabric out to sew it and made the mistake of sewing nothing, just a straight line that didn't attach anything. Finally, when I got it figured out, I ended up with the main piece, right side down, on the left side of the needle, the piece I wanted to add on on the right side of the needle, right side up, and the tape all folded to the left of the needle hidden where I could not see it. Instead of marking the line with chalk, I used my edge joining foot just to the edge of the tape fold, moved my needle one notch to the right, and I used a sharp stiletto to feel along the edge of the tape and slowly drag it ahead of the needle so I could see where the edge joining foot needed to follow. It kind of made a pressing line, too, so it was easy to see where to go. At any rate, I have a perfectly matched quilt back, which I am very proud of and would not have been able to do half as well if it hadn't been for all of the wonderful ladies on this forum. Thank you so much! Pat