So HOW DO I TURN THOSE CORNERS with the Quilt Binder?
The trick with this wonderful Quilt Binder is to sew ALL THE WAY TO THE EDGE OF THE QUILT AND then stop. Do NOT stop ¼ inch from the edge like you will be used to doing with your continuous mitered corner method.
Sew ALL the way to the EDGE of the quilt, then stop
Cut the thread and then GENTLY pull the quilt backwards out of the machine so that you pull about 4 inches of binding through.
Hold this length of folded binding taut and finger press to ensure the folds stay in place. Take care not to unnecessarily stretch the fabric as you finger press.
FINGER PRESS THE BINDING TO HOLD THE FOLDS IN PLACE
Bring the corner of the quilt towards you but at the same time try to keep the binding in the mouth of the binder.
Fold a mitered corner on both the top and bottom of the quilt at the corner. I find inserting 2 nice long pins with plastic or glass heads works well to hold the miter in place. I make sure the pin heads are to the outside (see pic). You could use glue if you prefer. 
Now here is where the tricky part comes: you need to gently pull the excess binding back up into the Quilt Binder Attachment as you feed the quilt back into the mouth of the binder. Try not to roll or stretch the binding. 
Take care that the underside of the binding is folded correctly (easier if you finger pressed first) and did not pull out yards of binding or push & pull the quilt about wildly as you did the steps above. Careful and gentle are the words.
ONCE BINDING IS PULLED BACK, YOU ARE READY TO SEW BINDING ONTO THE NEXT SIDE
Ensure the quilt is back in position and the needle is just above or slightly in front of the folded corner & pins.
Start sewing again slowly & then build up speed again till you reach the edge of this next side of the quilt.
Repeat for all 4 corners.
HOW DO THE JOIN THE ENDS??
See Part 3 of the Quilt Binder Review.
