One World, Always Online
There is no offline mode and no server to pick. Your character lives on the server.
Darkan is an MMORPG: there is no local game, no save file on your machine and no "new game". Opening the game means logging into your account, and your character is waiting where you left it.
There is also no address field: there is one official world. Choosing a server would be handing the player a decision that is not theirs to make.