You have a user account. You are allowed one - and only one user account.
Your account has a number of Character Slots. This is the number of characters You are granted three slots "for free" but you may donate to the game's development to purchase more (donations result in credits, which may be used to purchase character slots through the store).
Your account has several preferences which may be changed to suit your particular choices. These preferences include everything from your timezone, date display preference, visual "theme", language filter use, and various interface choices.
From time to time, you may receive system messages, such as when you are granted credits or an administrator has modified your account.
It is possible for you to ignore other characters and players. Messages sent to you (such as speech) from ignored characters will not be displayed to you.
You may choose to ignore a single character or ignore all characters owned by a player. This option is given to you at the time you choose to ignore the character.