You can create you account and sign-in at here,
Let's call it admin through out this documentation. Admin is where you can control everything.
You should have an email to create an account. Type in your email and clickbutton, then verification email will be sent. Click the button in the email, then you will be signed in.
We support 3 languages, Korean, English and Japanese. You can select of your favor at the upper right corner of admin.