Add brothers and sisters
First you need to create your own circle of brothers/sisters. To do this go to the brothers section and see who has already downloaded the application of your congregation (Pic.1). If those who are looking for are not registered yet, invite them using the Share button at the top right (Pic.2).
If you are adding a brother, then you have to wait for confirmation (Pic.3,4), while if you were invited you'll have to accept(Pic.5). Can accept it whether you are on the notification screen (Pic.6) or in the friends list (Pic.7).
Once your brother is in your circle (Pic.8), you can invite him to an appointment or be invited.
There is the possibility to remove from the circle a brother, but this will delete all common data (notifications, events, etc.)