Step 1: Pull out those strips you cut earlier. Make sure your top thread matches the fabric that you're using. Grab the end of one of the strips and fold it over into a little scrunched design- there's really no rhyme or reason to this,so just do what you think looks good for the center. Pin it on your shirt where you want the center of the rose to go.
Step 2: Put the presser foot down on the center of your rose, and start to sew. Sew a little ways past the center on the strip, then fold the strip at a 90 degree angle, and sew down a short ways. Flip the strip again, this time at a slightly bigger angle. Continue doing this all the way around in a spiral, until the rose is the size you're looking for. This may sound really confusing, but if you look at the pictures and give it a try you'll figure it out- it's really easy, and the best part is it doesn't have to be perfect. Every rose will be unique.
Step 3: Once you have the rose the size you want, cut the remainder of the strip off so you have about an inch. Tuck it under the last layer in a way that hides the edge, then stitch to the end.You're done! These really just take practice-you can get creative with them and figure out different ways to fold them as you're sewing. Follow the pictures and you should be fine!