How can I designate favorite?

You can mark any friends, chat rooms or communities as Favorite.

1. Favorite Friend 
Hold a friend you want to add to Favorite on Friend Tab and then, press Favorite.

2. Favorite chat room
Press and hold a chat room you want to mark as Favorite in Chat Tab and press Favorite.
Or click More Options on the upper right after entering into the chat room and then, press star icon on the upper right side to add the chat room as Favorite.

3. Favorite Community
Press and hold a community you want to mark as Favorite in the Community Tab or press Favorite after pressing More Options on the right side.