What does this app do?????? – BPPlus for Watch Review

Downloaded the app, and started it up. Screens look like the samples. But the app doesn't seem to do anything useful. I set the systolic and diastolic numbers that seemed relevant (120 and 80). The watch app apparently just allows you to change these numbers - I don't see any way to get the watch to tell me what my BP really is, which would seem to be the whole purpose of the app. Better instructions would be a big help here, but then again, the app is free, so I suppose that is indicative of what you get here.
Review by tbdbitl on BPPlus for Watch.