Step 4: Wind elastic thread around bobbin. Elastic thread is very easy to use. Just hand wind it around your bobbin, it shouldn't be tight and it shouldn't be loose. Then use it like a regular bobbin thread. Play around with the tensions on your machine to get the stretch you want. This can be tricky and all machines are different. Use regular thread for your top thread.
Step 5: Start sewing. I sewed 8 rows, ¼" apart. The more rows you sew, the tighter your shirring will be.