Simply sign up with whatever handle you want. When you click on the "New Characters" board, you can find an application for the "Main 8" Post there and wait and then you'll find out.
Realize that Freya and Blank will require different types of commitments and styles of RPing, so be sure you've made up your mind! If you'd like to I suggest applying for Freya since she's a bit harder, and if you're just not right for the character (sometimes even the best writers don't agree with certain characters and sometimes the worst do) then you'll still have a chance at Blank.
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