What exactly do you not understand?
As you can see, all the rules of forums are always indicated
There are a lot of different forums, some especially for Christians or different communities and some others for everyone. Some concern debates or discussions. Hobbies, Interest & Entertainment/Fellowship and games are more of the friendly kind. If you like a person, you can write something on his/her profile page or even follow him/her. If you like someone's post, like his comment to make him/her know! People also share blessings, always a nice feeling when you receive some!