SubMOA: instructions for using the app

Does any one use SubMOA on iPhone? For all I know, it might also be on Android.
Can find no help on the app and nothing on a Google search.

Note: I get a note that "The length of the title for this topic must be ranging between 10 and 255 characters." Why?

Utube video on it
https://www.youtube.com/watch?v=RPdafeiCKoU


called Range Buddy on android

developers web site

http://reloaderscloud.appspot.com/

Thanks very much.
Video has no sound, so it is hard to understand what the cursor is doing.

Here are the "instructions" I found:
"This is the start screen of Range Buddy.
Click "Take Target Picture" button to Camera Control Screen
Click "Choose Target Picture" button opens picture picker and allow choose target picture from library.
Click "Shooting Groups" button to Group List Screen
Click "Session Setup" button to Shooting Session Setup Screen
Click "Help" button will open up the web browser for this online help.
Group Analysis Screen was accessible after target picture was taken

Group Detail Screen was accessible from Group List Screen"
Since none of the buttons are labeled and there is no instruction on how to get to the various screens, I am still lost.

At the first screen there is a Help.  Click that and the instructions come up.  Not great instructions and geared toward Android version, but adequate.  Took me a few tries to figure it out.

I got it to sort of work, but the group size it comes up with is larger than what I get with caliper. Could really use words below button/icon so you have some idea what they are and a better user interface.
Thanks.