Firstly open up the Arkanius Client by clicking the icon on your desktop (or wherever else you've decided to put it) which looks like this:
Once the client has loaded you will see the client's menu as shown here:
Once you've got to grips with the client's menu (which by rights shouldn't take long) click register to open up the registration form to register an Arkanius account. Now pick a user name (note: you cannot change this once you've picked one, so pick a user name you'll remember, same with the password as show below, then click accept:
Once you've registered you'll see the character creation screen where you can pick you're sprite, along with it's hairstyle (by clicking next hair) and sex (by clicking the appropriate male/female buttons), once your happy with your sprite, the character creation interface looks like this:
When that's all done and dusted you'll be automatically logged into the game, and you will see the tutorial message below, followed by a short tutorial before you start playing Arkanius.. Good Luck!