Bring the needle and thread up through the back of the fabric

Next to the thread just pulled through, insert the needle back into and then up out of the fabric

Continue to pull the needle and thread through, this will create a loop

The needle and thread should be running through the middle of the loop with the loop underneath

Gently pull the thread to finish off the first chain stitch

For the remainder of the stitches, insert the needle next to the thread within the loop - this should be where the thread left off

Repeat the process, gently pulling the needle and thread over the hoop that is created and re-inserting the needle within this hoop -- to finish off this stitch insert the needle into the fabric and pull the thread through the back, tie it off with a double knot

Note: the further the distance between where you inserted the needle and where it comes back up through the fabric, the larger the chain hoop will be once pulled tight