Which fitbit do you have? If you have the flex, you tap on it until the two lights flash, then you are in sleep mode. When you wake up, you tap it again until the first light stays on, indicating it is ready for the new day.
On your dashboard, go to the little box with 3 parallel lines in it in the upper left of your screen. That will allow you to control which tiles are on the dashboard.
I hope that helps.
