I need some explaining

Hey ladies, I've been trying to get pregnant for about 4 months now. No luck so far.

Could anyone explain how this app works for me?

Such as.. What does AF mean? Are the hi lighted Green Day's the days We need to have sex in order to increase our changes?? Any advice would be more than helpful! :) I know all you beautiful woman are very busy but if anyone has the time to give some advice I would be more that appreciative 💙💙💙 much love to all of you xoxo