Left-click anywhere in the subject area to set a Focus Point. A white square will appear in the view-finder to show the spot you choose. The square will disappear after a few seconds, but the camera will remain focused on that point. Click again to set a different Focus Point.
NOTE: Adjusting the focus is only supported on the BACK camera of any iPhone. The front-facing camera (the "selfie camera") will auto-focus on its own. When you click to focus on the front camera, OpenReel Capture 2.0 will let you know the action is rejected. Focus is also not supported on Webcams.