With iOS8 and iPhone 6Plus not usable

The title should be enough but with some more details. The app is just not usable.
Wasted money which I at least will try to get back.
In any menu to set up the application I cant get further. No step back ok or anything else.
So the app is not usable.

heidelsocke about iTimeLapse Pro - Time Lapse videos, v1.2.1