Hello Ruth,
Placement takes practice, like anything new. Look at our tutorials on proper placement online at ContoursRx.com or our YouTube channel "Contours Rx".
I will also include our youtube video on the application process :)
https://www.youtube.com/watch?v=xQH7pUCRTIY
https://www.youtube.com/watch?v=PAJCnUTDnN4