From what you describe, I think you will be able to get it working. It doesn't really matter if there is a gap from the other rings.
As you calibrate the yaw stick - hold it in the direction shown on screen, and then click on the little ring that you see represent the yaw movement as described in the post above.
(Then, after you have gone through the calibration procedure you will come to the trim settings screen - there you can test if the stick input work as expected. And, you have the ability to manually adjust the trim/scale etc. if needed).