If you want to pull up the bobbin thread at the end of stitching, follow this.
Lift your pressor foot (to release the thread) and move your quilt over about 4" - this makes the length of thread.
Then put the foot down and hit the thread cutter -if you have one.
Tug on the upper thread and watch the last stitch you made to see the bobbin thread pull up, lift it with a needle and pull to the top. Once you get the system - it's easy.
It's also helpful to make sure when you stop stitching, that you make one more single stitch. Don't stop when you're making back tacking or tiny stitches or it will be hard to see the loop of bobbin thread to pull up.