the threads should be on the top- both the top & bobbin thread- bring the bobbin thread to the top before starting to stitch (needle down- holding top thread- needle up---brings bobbin thread up- hold both threads and take a few stitches- you can either make a few tiny (in place) stitches *locking stitch* then clip the threads at the quilt surface- or you can tie the two threads together- thread onto a needle and then push the needle into the quilt sandwich- weaving it into the batting a little ways- popping the knot into the batting- bring the needle back out & clip at the surface.