The system works by using your phones sensors. You make ONE post a day with your total activity. So if you have to run the app in the background all day long. It doesn't really split your activities or anything, at least not for now. When you get OVER 5000 points you become eligible for Actifit upvotes. When you are in the top ten you get also 100 bounty tokens of AFIT.

For delegations check this tutorial. The system will reward you once per week on Mondays and you can find your accumulated AFIT tokens on the Actifit Website when you enter your username.