From Aeria Browser Wiki
Buddy list: Add a buddy: Click to add players as buddies. After you add players to your buddy list, you can interact with them in special ways by clicking on their names in your list. When players on your buddy list log on to the game, you will receive a notification in your chat box. You can turn this off in your settings (see next post).
View Vanity: - View which vanities your buddy has managed to accumulate. Private: - Chat with buddies in private by using whisper mode. Copy Name: - Copy a buddy's name so you can paste it by pressing Ctrl+V. View Profile: - Check a buddy's information like their appearance and equipment. Blacklist: - Add your buddy to your blacklist so they can't contact you again.
You can also use the small buttons to the right of your buddy's name to begin a private chat or remove them from your buddy list. You can also use the search function to search for a player on your list.
Black list: Players you add to your blacklist will not be able to send you private messages and you will not see them chatting. You can remove players from your black list by pressing the X to the right of their names. You can also use the search function to search for a player on your list.
League: Allows you to view all online members of your league and whisper them directly by pressing the small speech bubble to the right of their names. You can also use the search function to search for a particular member.