To connect your Facebook Group accounts to Postcron for notification reminders click on the + sign button at the top right side of the screen, and click on Facebook. Then, select Groups.
You will see a pop-up explaining how posting with notification works. After reading it carefully, confirm by clicking Ok, connect my Group.
Then, name the account and click on Continue.
The name doesn't necessarily need to be the same as the Group, just make sure it will help you easily identify the account once you get the notification.
Now confirm by clicking on Add Account.
All the social accounts you connect to Postcron will be displayed on the upper part of the screen. You'll see the Facebook logo alongside a people icon to help you tell them apart.