Here are instructions for how to set a password.
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1. If you're logged in to your account already, log out by clicking on the user icon in the upper right corner.

2. Log in again and type in your email. You'll then be given two options: you can log in with email or with a password. Select Login with Password.
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3. You'll receive an email with a link. From there, you'll have the option to login with your password, and you can use the password every time you log in.