iPhone 4 (ios 7.1.2) bluetooth not seeing MCUI app?

[lectrocrew]

I have an app installed on my iPhone 4 that I need to make adjustments to the controller on my myo-electric prosthetic arm. I'm not too familiar with iPhones. I use Android and this app is not available for Android. All I can afford is this old iphone 4 that runs ios 7.1.2 which is suppose to run the app (which it does) (app requires ios 7.1 or newer), but this phone can't see the device.  (MCProPlusETD4952) in bluetooth search. The app tells me to "turn on bluetooth" but the phone bluetooth is on (eg it see's my Yamaha YB-11 audio adapter). It also does not show my laptop in bluetooth search but it will receive a BT request from my laptop and it will connect to it. My laptop BT shows this iphone, YB-11 adapter and MCUI (prosthetic arm controller). So why is this app not connecting via BT? Screenshots are here:
https://www.dropbox.com/s/ctqq2mttplocwdc/BT%20devices%20found%20on%20iPhone.jpg?dl=0
https://www.dropbox.com/s/941618co7fj1r3w/No%20BT%20error%20on%20iPhone.jpg?dl=0
https://www.dropbox.com/s/hfc8phzafol4qbm/BT%20Devices%20found%20on%20my%20laptop%20PC.jpg?dl=0

MCUI App is here:
https://itunes.apple.com/us/app/motion-control-user-interface/id787443186?mt=8