Okay, I think you're asking about the underbust tightening. If you can watch carefully again. You'll see I first inputted an underbust measurement then I was left with some excess. It was that excess that I took out on both side of the dart then I drew a line to connect that point to the bust point/ apex.
Thank you, thou I still can't figure out what aspect of Sewing that wasn't covered or explained in the video. You can ask your question on area you're confused and I'll try to respond as soon as possible.
Thank you. I am open to learning so, if you know a better way of achieving this, I would love it if you can tag me or simply notify me when you'll be making yours.