I vary from video above, because i DO use the word 'STAY', and did not teach my dogs that sit means sit til you are released. He knows "stay".
It hasn't confused my dog.
but, above method can still be used, if you do choose to use word "stay" instead of just training all positions mean they are held until released.
If you still are having specific problem, and can't see the answer to it (happens to all of us, sooner or later!!)
be sure to post it!
someone else might have a good idea...or maybe had same problem...
Welcome!