You can access the logbook from the launcher or by swiping right when in the training insight display.
Tap on the log entry you want to view and scroll through log by swiping up or down or by pressing the upper right or lower right buttons.
The log icon remains gray until the Move has been synced with Suunto Movescount.
To exit the log, swipe right or keep the middle button pressed. You can also just double-tap on the screen to return to the watch face.