This works in Clock and other sense native apps on at least sense 3.0
It’s pretty easy once you’ve gotten the hang on it. It’s just to long press ANY icon in the app, used Clock in this example. Once you’ve long pressed an icon then you’re in move mode of the icons. Then its just to do as the text says, “press and hold to rearrange”. And when you’re done rearranging you just back the Back button to get back to normal mode.