All you need to do to reserve a name is to log in to the game, start creating a new character, and then follow the prompts from there. An extra character slot will be added to the game when the Paragon launches, but if you already have the maximum number of characters on a server, you will have to delete one to reserve your name. The name is also coming with a built-in expiration, as it remains reserved on the server for one month after the Paragon goes live. Still, at least this way you won’t be resorting to the dolphin sound approach.
TERA, which is a good thing; it’s another class to play. But how do you know there will be any names left when the class finally goes live? You could come up with a name that other people are unlikely to use, either due to originality or being an unpronounceable mess that looks like dolphin sounds, or you could take part in the game’s name reservation even running all through March.
Source: Official Site